Bash convert string to number. "Tradition" I guess.

Bash convert string to number The '/ \n' says to divide the string (split it) on newlines. Hot I'm currently working on a project called 'dmCLI' which means 'download manager command line interface'. Firstly, it shows the offset of data in the leftmost column. I want to convert my integer number to ASCII character. The $(()) sets up an arithmetic context and the 10# converts the number from base 10 to base 10 causing any leading zeros to be dropped. Something like this may help you, depending on which way you want to round your number. A Unix timestamp is the number of seconds since Jan 1, 1970, UTC so it is important to specify UTC in the input. How to convert string to number in bash. Your script isn't working because of an order of evaluation thing: curly brace happens before #!/bin/bash # This is a simple bash function to change strings (of arbitrary length) into integers (of arbitrary maximums). The answers there deal either with binary byte (as opposed to binary number, i. I don't recommend the character class, but tr 0-9 a-j is succinct. Viewed 2k times 0 . I tried to put double quotes around the variables and the numbers but did not work. Modify and Replace $1 (awk) or \1 (sed) Values from Decimal to Hexadecimal Globally in Bash sed convert string to int or float. [:upper:] is a character class, which is just a fancy way of saying it's a list of all uppercase characters (though there's some question over whether tr properly considers Unicode rather than just ASCII). I have a date in this format: "27 JUN 2011" and I want to convert it to 20110627 Is it possible to do in bash? Skip to main content. Also you must enable globbing by placing sed commands into double quotes instead of single and change separator for 's' command like that: So I want to make sure I convert the variable value in a string before doing the comparison. there are no types in bash, it's just all cast on demand, you presumably just want to do a specific kind of string mamipulation as bash doesn't store a number as a number, etc, it's all just strings so you premise of "converting" anything is invalid. Retrieving values from json file using jq. All of the tricks in the other answers (e. Assume that k("a") and k("b") are the codes of these two strings. Hex:Binary d43c23F1:11010100001111000010001111110001 I have a string in the format "yyyymmdd". I have a string that I have to convert into int or float depending or the case : What I have => What I want "548189848. There are only contexts in which a string can be interpreted as an integer. With your constraints, you are looking for a unique integer number that falls inbetween these two values, but k("a") < k("a. Using bash, I have a list of strings that I want to use to replace an int. From an efficiency standpoint, about the best option I could come up with would be to replace xdd, 3-pipes, and 3 calls to sed with od and 2 bash parameter expansions. ö§«¢ are not bytes; they are nominally Unicode characters, which utilize 8 bytes when encoded in UTF-8 and UTF-32, and @MestreLion That may have come out wrong, but I needed to replace a standard variable name in a bunch of files with an absolute path, for which i was using sed inplace replacement. Add floating numbers in bash. adding a number variable with a string. Both lines contain a number. This is a bit overkill for your use case, but here's a shell function that compares typical version strings. #!/bin/bash read -p "Enter first number: " num1 read -p "Enter second number: " num2 I know you can use the the "expr" or "bc" command to automatically convert the string to a number then add them together. Often you may want to convert a string to an integer in Bash to perform some arithmetic operation. Using awk, I can produce a comma separated sequence of numbers as such: seq -s ',' 0 2503 What I need to do is convert the output into one large string. Bash history timestamps broken when called from command string in MacOS. 21. Visit Stack Exchange My 'Real goal' actually isn't to assign a variable with the name as a number. Bash compare string and integer together as multi-conditions. Currently I do this: echo $((0xe0)) | hexdump -c And I get this output: 0000000 2 2 4 \n What I want to get is: 0000000 e0 How should Bash: Convert a string (version number) to an integer. array, int). Commented Dec 24, 2018 at 16:03. , unary plus) involve implicitly coercing the type of the string to a number. Hot Network Questions Bringing in a peanut butter sandwich to discourage lunch thief who has peanut allergy Confused of this usage of 排他的 Pete's Pike 7x7 puzzles - Part 3 Convergence to a Lipschitz function You should not care too much about the internal representation of a scalar in Perl, unless you're doing some weird things (and please tell us if you are). number as string=5e number=35 number as string=51 number=35 number as string=58 number=35 number as string=4a number=34 number as string=4c number=34 bash; Share. Starting with the original string: 20151020T113100. [:lower:], then, is the list of all lowercase characters. The leading 0 is leading to bash trying to interpret your number as an octal number, but octal numbers are 0-7, and 8 is thus an invalid token. Hot Network Questions Is there a word or a name for a linguistic construct where saying you '4 125 -19 0' is not 4 bytes. 54" => "548189848. @U. I have posted To convert the number back to a string of 3 characters representing the number with leading zeros replaced, just use printf with the "%03d" conversion specifier, e. Viewed 3k times JQ convert to number, convert to boolean when generating new json from shell variables. { # Convert an IPv4 IP number to its decimal equivalent. Bash convert string to timestamp. I have a function that is supposed to check for user processes and wait for 0 count before exiting the function. The %u will print the unsigned decimal integer of that number. Try Teams for free Explore Teams The leading 0 is leading to bash trying to interpret your number as an octal number, but octal numbers are 0-7, and 8 is thus an invalid token. Modified 4 years, 7 months ago. Adding 0 won't convert a string into an int. Question - will it not base64 -d converts into byte array ? The string dGVzdA== is base64 encoded string test. 475 One close format that date will accept is: 20151020 11:31:00. – Caveats: The hex numbers must be preceded by 0x, and the HEX column actually lists decimal values. With bc you need upper-case hex digits. I've been doing this way since before bash was born, and afaik $_ is nothing in POSIX shell. But I need to number of spaces to match the tabbing so that the format is identical. I have variables that need to be converted: How to convert a string containing a number into its binary representation? 1. Convert text file to JSON. bash can't handle floating-point arithmetic at all; zsh can, but only in an arithmetic command like (( a1 < 0. Viewed 1k times 1 . Visit Stack Exchange In Bash, values are untyped but usually treated as strings. 1. Given a string like '2013-04-06', I want to convert it to a integer as we can do in Java. How to convert start/end date to week duration in Excel? 0. See this for a best example to learn the untyped nature of Bash. /[0-9]$/ { print $0 } Match lines that end with a digit (the $ matches the end of the line), then run the code inside the {and }. In bash, you can convert a string to a number by using the expr command or by using arithmetic expansion with $(()). A leading ‘0x’ or ‘0X’ denotes hexadecimal. In Bash, you can get the length of a string like this: ${#inputNo}. lang. Here are some examples: Here are some examples: Using expr command: Your problem has nothing to do with types; to a first approximation, bash doesn't really have those. No need to "convert" data types. Hot Network Questions Help with finding apps or software I am iterating over a range of numbers but would like to switch from an integer to a floating point number with one decimal place (e. 0000", etc would just stay as they were and therefore fail the string comparison as intended, while things like "3. Brace expansion is performed before any other expansions, and any characters special to other expansions are preserved in the result. 23353 in locale en_US; Otherwise, use printf with the ' field flag wrapped in a shell function that preserves the number of input decimal places (does not hard-code the number of output decimal places). "Tradition" I guess. So I have a file that has two lines in it. I have no idea how to do this in bash shell. Why then, is the total result a string? That is because brace range directive in shell {1. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. bash shell script, issues with lets say i want to convert a string "76" to integer 76. $ printf '\x5F' | xxd -b | cut -d' ' -f2 01011111 Or $ dc -e '16i2o5Fp' 1011111 The i command will pop the top of the stack and use it for the input base. Ask Question Asked 6 years, 1 month ago. We can convert in java like this: int i = 97; //97 is "a" in ASCII char c = (char) i; //c is now "a" But,is there any way in to do this shell scripting? Is this possible with (a) a bash command using a tool like jq, or (b) is there some python solution? Our full NDJSON is ~10GB in size, and performance is important as this is a step in our daily data-ingestion pipeline. That said it doesn't really matter. Here's an example: day1=Monday day2=Tuesday day3=Wednesday day4=Thursday day5=Friday day6=Saturday day7=Sunday If I hav In BASH shell scripting or using gdate, given a date like "Oct 2011" how do I convert to a year-month number format? Output should be "2011-10", for example. – Pure Bash solution with no loop: #!/usr/bin/env bash str='The quick brown fox jumps over a lazy dog. Comparing strings with numbers in shell script. Bash doesn't make this variable read-only, so I'm free to continue to use it as a throw-away. Compare the strings. To convert strings to integers in bash, wrap them in $ ( (X)). Whatever looks like a number is a number. But I don't want to add these numbers, I just want to convert the string to a Stack Exchange Network. Use the awk Command to Convert String to Integer. In that case, things like "3. What does bash --version show on your mac? It is in man bash under the heading ${parameter^^pattern} under the broader section of Parameter Expansion. Note, stdbuf is highly recomended for real-time stream processing. The reason is because hexdump by default prints out 16-bit integers, not bytes. 00000000' '1600000. It may be the decimal integer representation of 4 bytes which are being interpreted on its binary integer value, but it utilizes 8 bytes (excluding spaces). Parsing There is one way to do it, without using date command in pure bash (for portability) Assuming you just have an input string to convert "5 minutes 10 seconds" in a bash variable with a : de-limiter as below. As per man bash. If we try to even things up a bit by making the initial string longer, we find practically the same times for the version using tr, but about 0. Viewed 82k times I've often wanted to sort strings with numbers in them so that, when sorting e. Modified 10 years, 11 months ago. I also uploaded my code into Github Repo. If you run that command, it will output the size of the file in bytes. Convert date time string to epoch in Bash (8 answers) Closed 11 years ago. Hot Network Questions In BASH convert a string with . a") < k("b"). If I were you, I would add some logic to remove a leading 0, add one, and re-add the leading 0 if the result is < 10. The expression $((2#)) converts "" from base 2 to decimal. this will give you numbers that honor the total order relation on dates and ASCII->hex: The secret sauce of efficient conversion from character to its underlying ASCII code is feature in printf that, with non-string format specifiers, takes leading character being a single or double quotation mark as an order to produce the underlying ASCII code of the next symbol. Convert string to integer on Windows Batch. but you cant have "/" without escaping it in the command. prints yoyo2) but it shoudl have gone into the third one and printed yoyo3. Converting a string into Unsigned int 8 array. It is often required to convert numbers, such as Unix timestamps, to a human-readable time format in Bash. Hello, I'm very new to shell scripting in Bash. Both '0-9' and '[:digit:]' map to 0123456789, and 'a-j' maps to 'abcdefghij'. See more linked questions. Convert date string to date epoch UNIX AIX. Discard integer and keep floating point. The default grouping of 4 bytes may be changed using -g. Bash: Zero-pad a number with a variable for the digit count. I am sure I have more than one issue in my code, but the stumbling block right now is that I am trying to convert the value of my variable from a string to integer. that printf supports (and that subsets includes g, but not d). 3. The single quotes are a good idea around the (verbose) '[:digit:]' term; the others do not need the single quotes, but they do no harm either. Can't seem to be able to figure this out in BASH. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I read in two numbers from a user but the number is a string. 4. Nesbit's Man Bash thinks it is an octal number. In bash, how can I convert an hex-encoded string like this: 2e2f65202d6b2022616622 or \x2e\x2f\x65\x20\x2d\x6b\x20\x22\x61\x66\x22 (or something similiar) to:. Clearly, we need a really big string to measure bash's speed accurately. – user233390. Also, numbers 128-255 aren't valid UTF-8, so they may cause trouble in some situations. ; Hex digits must be in upper case to avoid collisions with dc commands and are not limited to A-F if the input radix is larger than 16. Most obviously, zero: the zero (or "null") byte cannot exist in a C-string (because it delimits the end of the string), so it cannot be stored in a variable or passed as an argument. One small correction: strictly speaking, seq supports a subset of the format chars. Bash however, just adds the numbers together. Ask Question Asked 3 years, 11 months ago. Look at the following command to do this: Excel 2007 Conversion of number to long text format. (there may be more efficient ways, but this was what came to mind) I need to produce a string of numbers as such: '0,1,2,3,4,5,6' going all the way from 0 to 2503 (inclusive). /script. Regardless of the original base of a number, arithmetic expansion in Bash always returns the equivalent decimal value of the number. 1 to it. Bash sed convert string to int or float. e. BUGS There are no This is not possible with the constraints you have given, unless you impose a maximum length. Modified 3 years, 11 months ago. Is it possible to convert a hex string to uint64_t (or unsigned long long int) using bash script? The number is FFFFFFFF3D4331BC? It seems that the bc command doesn't work with unsingned numbers? In Bash, I'm trying to increment a counter variable (number) from within a text string. First thing you can try, if you're absolutely positively sure that all your numbers are integers: convert them to I have a bash string 20220416124334 (the string is not epoch) and I want to convert it to date format so it should look like this: 2022/04/16 12:43:34 I've tried: [manjaro@manjaro ~]$ date -d ' with a number that represents the number of seconds since the epoch. 54" "548189848. . terminal timer with end time given through bash. For example, expr doesn't care what you hand it; it just echoes it back unchanged if it's not recognized as a number or numeric expression, so your two "conversions" don't do anything at all. In an arithmetic expression, for instance, values would be automatically converted to/viewed as numbers. Like uuencode(1) and uudecode(1) it allows the transmission of binary data in a `mail-safe' ASCII representation, but has the advantage of decoding to standard output. a" (and Let's break it down: function pp(p) { printf "%u\n", $0 * 1024^p } Define a function named pp that takes a single parameter p and prints the $0 multiplied by 1024 raised to the p-th power. . #!/bin/bash floor_val= ceil_val= function floor() { float_in=$1 floor_val=${float_in/. mp4)"; [[ "$size" -gt 4000 ]] && echo "bigger" || echo "smaller" bigger The basic syntax involves using arithmetic expansion $(( )) to convert a string to a number. *} ceil_val=$((ceil_val+1)) } float_val Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Using Arithmetic Expansion. Excel 365, convert text to date. ' says take the input as it is. Switch to little-endian hexdump. – Then in the string I pass to jq, the '. Stack Overflow. You can use -gt or -lt to compare numbers: size="$(stat -c%s test. Arithmetic expansion supports base conversion of numbers. Unix: Expressing a number in certain digit format padded with zeroes. 00" => "548189848" "0. Here are a couple of ways Bash can strip the leading zeros for you. in float. bash: how do I write base64-encoded content into a file to specified line. There are no string or integer types to convert. 00195" would be chopped down to "3". Improve this question "\n"; While perl might be a good choice if you're doing a lot of this, using the shell's printf to convert your number into something that can go into a \0 escape sequence works and I would like to convert them to numbers before printing them because they're not that readable this way. Display month from number in bash script. Windl: Question is How can I convert time string to UNIX timestamp. Adding 0 is a common method for changing a string number into a non-padded integer. As there is an infinite number of strings of style "a. BASH - Convert textfile containing binary numbers into a binary file. Modified 2 years, 2 months ago. Using Parameter Expansion. jq returns "Invalid numeric literal" with --arg. dialog --menu outputs integer instead string on bash. You can use this command in a How to convert string to number in bash. # The code when executed for a directory of size 3318222 goes into the second elif block (i. Bash convert a number of epoch values to datetime. bash script on padding 0 on digit with character. tr needs two arguments - the list of from characters, and the list of to characters. Rather, variables are simply treated as strings or integers based on the task you’re attempting to perform. I'm looking for an easy way in Bash to convert a decimal number into a binary number. If I call the counter var alone it increments successfully, but If I echo the string variable on each iteration of my loop, the counter variable does not increment. # I use this to convert my "user@hostname" to a number between 1-255 and use that as a persistent color for the # termnal prompt to remind me what box/user I am on. In bash, you can perform the converting from anything to integer using printf -v: Floating number will be converted to integer, while anything are not look like a number will be In Bash, you can convert a string to a number simply by performing arithmetic operations on it, as Bash automatically interprets the string as a number in that context. It is strictly textual. However, numbers in batch scripts can be treated in more than one way. convert string to numbers and minus sign [closed] Ask Question Asked 10 years, 11 months ago. 475 This function is a bit of a hack to the OP's request as it converts epoch seconds (number of seconds from 1970) to a chosen format, which means that if you give it more than 24 hours worth of seconds it will increase the day count and start the hours again Bash: How can I subtract two time strings using bash? See more linked questions I have been lately using unicode more often and wondered if there is a command line tool to convert unicode between its forms. In the last but one column I'd like to truncate precision to 3 digits after the dot and in the last column I'd like to divide by 1M. Provide details and share your research! But avoid . The problem is that you're using the wrong The greatest supported number varies from shell to shell but could be as low as 7FFFFFFF while for bc, there's no limit. So, no, this question is not a duplicate of that. For example. I was stringing the operations together in bash. Here’s a code snippet demonstrating this: xxd -b quoted manpage : xxd creates a hex dump of a given file or standard input. e text) the result of arithmetic evaluation is incorrect. 2238. The behavior of characters d and g differs subtly in that d interprets 0-prefixed numbers strings as octal numbers and converts them to decimal, whereas g treats them as decimals. 23353 # -> 12,343,423,455. This option treats byte groups as words in little-endian byte order. There's a nice article Is it a Number on this topic. Display relative date with `date` in human-readable format. And since you can do substrings, you can do this instead: if [[ ${#input} < 2 ]] then inputNo="00${inputNo}" inputNo="${inputNo: -2}" fi This question: Binary to hexadecimal and decimal in a shell script Asks how to convert FROM binary, not TO a binary number. Modified 5 years, 8 months ago. In the json these fields are strings. 0000" => "0" This solution works with any number Can someone explain how the number 2909 is generated in this bash code? and how to fix it without sed/awk/dc. Hot Network Questions Should I follow my processor manual @ULick - Ah, I see. From the bash manual: Constants with a leading 0 are interpreted as octal numbers. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. I'm using curl to multi-part download a file. Because If you consider both input as string then they are not equal difference is there in precision. Then after, it shows the hexadecimal value, and in the rightmost column, it shows the ASCII value of How can I compare numbers in Bash? 0. No need for piping echo into wc or using a while loop. The determining factor is whether the value of a variable contains only digits. "20121212" string into "20121212" date I need to convert signed int32 number to unsigned using shell script for example : convert Input : -256 Expected output: 4294967040 bash script convert signed hex to signed decimal. About; Formatting date strings in a file with linux bash shell. not as one big string but several strings spearated by a space or more than one space character. The awk is a pre-compiled command allowing the user to print formatted expressions containing variables, numeric functions, string functions, and logical operators. Why Can I add a String and a Int in Bash. shell script to get year, date and month from YYYY-MM-DD format. They all agreed. You can truncate the Bash string by utilizing parameter expansion without any external command. Convert a Simple In Bash, you can convert a string to a number simply by performing arithmetic operations on it, as Bash automatically interprets the string as a number in that context. But somehow I can't set the variable as an integer. -X' is a repretation of 4 bytes in the ASCII/'C' style; it is utilizing 5 bytes. The default base for Bash arithmetic is 10, but one can specify a different base using the syntax base#number. ; The o command does the same for the output base. (@EdManet: that's why jq cannot convert string to int in bash. Sorting strings with numbers in Bash [duplicate] Ask Question Asked 11 years, 7 months ago. Cannot format date in bash mac. /e -k "af" Is it possible to discover a "Universal formula" that generates and generalizes all odd Collatz numbers? for string length < 4k or so, pure bash is faster than gawk; for delimiter length < 10 and string length < 256k, pure bash is comparable to gawk; for delimiter length >> 10 and string length < 64k or so, pure bash is "acceptable"; and gawk is less than 5x faster; for string length < 512k or so, gawk is "acceptable" If you want ot replace part of path name you can echo path name and take it to sed over pipe. FYI, this is the required input for an argument (--target) in the GPAT++ tool iHS. 5" "548189848. Would this not be the best way to manipulate a string in bash? 1. But it actually would have worked if you'd replaced the -eq with = (i. To be honest, this looks like a text file, not a binary file, if you can put it into a text editor and get numbers and letters out. Use numfmt, if GNU utilities are available, such as on Linux by default:. Like this: If the string has an identifiable number, it will be treated as a number. Integer ASCII value to character in BASH using printf. It follows a subset of the Debian version comparison rules: The Yes, posix test ([) would not convert an string to a number on numerical comparisons: $ sh -c '[ 2+2 -eq 4 ]' sh: 1: [: Illegal number: 2+2 $ dash -c '[ 2+2 -eq 4 ]' dash: 1: [: Illegal number: 2+2 $ bash -c '[ 2+2 -eq 4 ] && echo "YES"' bash: Basically, @Bali C is correct. This option only applies to hexdump, leaving the What's the best way to convert a literal string (e. Neither shell has an integer type. Boolean. You can use od -t x1c to show both the byte hex values and the corresponding letters. Convert a string to number. Introduction to the Problem The output is 980. sh InputFolder/ Number_of_iterations the script should work inside the given folder and run a for loop as many times as the Number_of_iterations variable is set to. But thank you for offering a pure bash solution to a "How to in bash" question! Sometimes that's actually what people are looking for. s="05535" echo $(( s )) >> 2909 currently have this is my code which I don't li a preceding 0 makes it octal, not decimal, so '8' doesn't exist. – Etan Reisner Stack Exchange Network. "True" into the appropriate bash boolean variable). A locale-sensitive result can be gained like this; put the number into the month-position of the date, passed as date to be output to date, and choose an arbitrary year and day (keep away from the 50ies and the far future, and avoid days much greater than 20). Assuming you stream represents constantly changed numeric parameter, it may be converted by hexdump or od from coreutils. Parameter expansion refers to retrieving and manipulating the value stored in the Bash string to number with number leading with zeros. It will convert it to a float. – Stéphane Chazelas There are several alternative ways of specifying the digits and letters. 05 )). 9. And I'm having trouble with my code. I'm forced to use jq. I can't convert string to int. Calculate arithmetic calculation on floating numbers in shell scripting. pre { overflow:scroll; margin:2px; padding:15px; border:3px inset; margin-right:10px; } Code: #!/bin/bash read -p "Enter first number | The UNIX and Linux Forums Essentially, Bash variables are character strings, but, depending on context, Bash permits arithmetic operations and comparisons on variables. See this for arithmetic operation in Bash. So an example of the string I have is "5. Setting variable to floating integer value. 0) as illustrated by the loop below. I need to convert a string with tabs to a string with spaces. 2 second longer than before for the all-shell version, if the string to convert is "Hello, world!". Hot Network Questions Can MAP-Pro gas be used in a propane camp stove? How plausible is this airship design? Megahertz oscillation in BJT differential amplifier Zhuyin (注音) for characters with just initials My supervisor said I didn't have any funding to disclose, but now the funder is upset. 0000') as string and give the result as true. You probably need to loop through and echo out into decimal format. That is part of bash that converts all values in the first positional parameter to all upper-case. Ask Question Asked 10 years, 9 months ago. How to print float value from Let’s use the xxd command to get the hexadecimal value of the “hello” string passed via stdin: $ echo -n "hello" | xxd 00000000: 6865 6c6c 6f hello. How I can convert in bash a string in hex (for example "d43c23F1") to binary. By the way, Bash doesn't support float numbers, it only works with integers. I read in two numbers from a user but the number is a string. i have the following SNMP Command Extracting a json value from bash shell using awk without having to resort to both awk and sed. As you can see, there are a number of different ways to approach this problem. Someone please suggest how to cast the strings as integers and do a comparison. In this tutorial, we will explore alternatives for those conversions when dealing with numbers in the Linux command-line interface. , just doing regular string comparison instead of a numeric "equals" test). *} } function ceiling() { float_in=$1 ceil_val=${float_in/. It seems your number is a formatted date yyyymmddhhmiss. Extract numbers from bash string and save the resut into array. So 'strings' probably won't work. convert string ddmmyyyy to yymmdd using linux. As correctly noted, the key is finding a format that date -d "string" with consider a valid date/time string. overwrite file and echo to stdout. Most times, any value is a string value in cmd unless the context either requires or suggests it be treated differently. Comparing the integer using IF condition in bash script. Here's my full code. First, we will discuss issues with the mathematical operations on strings, and then we will see how to convert a string to an integer. 2. Modified 2 years, 5 months ago. Or do you need to check if the string is a "real" number? Well, actually, any string is. First thing, bash cannot do arithmetic using floating point arithmetic. Otherwise, numbers take the form [base#]n, where the optional base is a decimal number between 2 and 64 representing the arithmetic base, and n is a number in that base. It can also convert a hex dump back to its original binary form. ' # Need extglob for the replacement pattern shopt -s extglob # Split string characters into array (skip first record) # Character 037 is the octal representation of ASCII Record Separator # so it can capture all other characters in the string, including spaces. However bash doesn't let me use the "-eq" operator and tells me The %d format specifier results in only the integer part of the number being printed, rounding it down. It is a string in bash and I want to get it converted into a date so that all other date functions can be used on it. I want to check if that number is a 0 or not and then echo it out if it is. Hot Network Questions Who can be a primary supervisor for a PhD student? Paint for a printed circuit board for finding the heat dissipation Ranking of binary trees Banding appearing in skin of chaacter with subsurafce scattering during render Convert string to number. Note that there's no need to save an restore the field separator - you can simply assign a temporary value when you read the string #!/bin/bash # create a map (lookup table) from items to values declare -A values=( [hat]=1 [shirt]=2 [trousers]=4 ) # (an ASSOCIATIVE array) my_outfit='hat+shirt+trousers' # Bash has an extension called "bash arrays" that allows to create an array. Does anybody know how to do this?Thanks for any help. AWK convert big unsigned int to signed int (binary) 0. To convert a string into an This tutorial will discuss string to integer conversion in Bash script. Ask Question Asked 5 years, 8 months ago. How to convert shell script variable from string to an integer. One way is to parse it and the other way is to change its type to a Number. It iterates over every file in the working directory, and attempts to print the cumulative size of all the files over which it iterated Is the syntax specific to printf or is it used anywhere else in BASH? (Such small strings are hard to Google for. Bash string to integer comparison. Would be nice to be able to say: uni_convert "☃" --string And know that the string is defined in unicode as a "SNOWMAN". I have searched around the internet, but I only see how to convert a string to an integer. What I actually wanted to do was to compare bash convert hex string to integer code using printf failing. Filter files on a s3 bucket based on the file name. The context is this: I want to convert a number to its byte equivalent. Convert human readable time into EPOCH using shell script. 50" => "548189848. '\t. (BTW these aren't types per You can't do this in bash, because some bytes aren't valid strings. I want to output a string by adding random integer to a variable to create the string. Hot Network Questions Rectangled – a Shikaku crossword Why do the A-4 Skyhawk and T-38 Talon have high roll rates? What have you been doing? Understanding a quotient space and finding a basis Meaning of "corruption invariably lurked within"and "fever-traps and outrages to beauty" in E. Here's the script I'm working on. In Bash, it’s important to note that you don’t “convert” a variable from one data type to another. As per numeric value the result given by the command is correct. How would I do this in BASH? I remember in Pascal I could do something like char ('7')+39 or some such, and that would convert between character and a number corresponding to that character. It's not entirely clear, but I think you're asking how to convert a floating-point value (myduration) to an integer in bash. It has been part of bash as a while. How to convert string to int in bash? 0. convert signed to unsigned value in C. ) bash; ascii; printf; Share. In this expression, spaces are not required like these were mandatory in the expr command. 0 if [ $string \> $BaseLine ] then echo $string else echo "TOO SMALL" fi Using the “$(())” Arithmetic Expansion Operator. Bash - Remove leading zero for numbers with double digits. Converting Numbers to Time Format in Bash. [123456789] will leave the wanted number in ${BASH_REMATCH[1]} allowing you to compute the new number using the builtin, e. 0. This is because bash is not seeing this variable as one string since the variable is not enclosed tl;dr. Note that strings are zero terminated - it's impossible to store the zero byte. How do I iterate over a range of There are two main ways to convert a string to a number in JavaScript. from 5 to 5. If you look at the code that i uploaded, you can see that i am trying to use a for loop that can make and assign different values and names an infinite number of times. In order to convert a string into an array, create an array from the string, letting the string get split naturally according to the IFS (Internal Field Separator) variable, which is the space char by default: in my bash script I try to use a number as an input variable for a for loop I run the script as . Reading and writing integers to a text file with batch script. date -d '1970-01-01 1357004952 sec UTC' Mon Dec 31 17:49:12 PST 2012 If you are on a Mac, then use: date -r 1357004952 Command for getting epoch: date +%s 1357004952 Credit goes to Anton: BASH: Convert Unix Timestamp to a Date Here's a variant of your original method, but using bash arrays. You would have to explicitly declare any of the other types (e. As Mark has mentioned in his answer, a simple substitution will fail in cases where there is no leading digit, How to convert string to int in bash? 0. groupDigits Works at least for bash and mksh. 10} doesn't support a variable in it. If you have an old awk based on The One True AWK by Brian Kernighan, such as macOS awk or FreeBSD awk, you will see this at the bottom of the manpage:. ; The p command will print the How to convert a bash string into a date? 2. bash script syntax to compare strings as integers. We can see that xxd shows output in three columns. win7 - batch - Changing number/string in text file. : a base-2 number) using xxd, or some other external tool. So you can convert the string dGVzdA== to the string test:. According to man xxd:-e. I compared the results of this implementation against GNU 'date' for a large number of random dates and times between 1970 and 2038 on a modern Linux system. Ask Question Asked 2 years, 5 months ago. Converting values to numbers is primarily meant for calculations, especially for creating scripts. If you have xxd (which ships with vim), you can use xxd Don't convert the version string to an integer. g. Without using the utility bc. The example I showed above can be corrected as: Anything you do inside $ ( ()) Here is my simple solution: BaseLine=70. bc is a basic calculator. Great, comprehensive answer. valueOf(String) Right now I'm using this in Bash: 5. 45" and I want a floating point equivalent so I can add . The '- [""]' says to remove from the resulting array any empty strings (resulting from an extra newline at the end). Convert json numbers to strings in the shell. tr then takes both lists and translates characters I have a string which holds a decimal value in it and I need to convert that string into a floating point variable. Viewed 122 times How to convert a string to lower case in Bash. How to request integer input from user in batch file. I'm trying to figure out how to treat the output of stat -c %s filename as a number, and not as a string. user=`yarn application -list -appStates ALL -appTypes MAPREDUCE | grep application_id | awk -F "\t" '{print $4}'` Bash's basic type is string. Asking for help, clarification, or responding to other answers. The value in using -e is that if the sed script ever needs to start with a -(which may or may not actually be possible) you won't need to remember to add -e and if you ever want to add a second script to the command you can just add -e <script> to the end without needing to go add -e before the first script. The -d option of the date command can convert timestamp numbers presented in seconds into a time-date format. Bash compare string vs integer not working. Comparing numbers in bash (man bash - arithmetic evaluation) can be done with (( )) for hard coded numbers but with variables there is a bug: If one of the variables holds not valid number (i. Here it is: dmCLI GitHub Repository I would recommend using Petesh's answer, but here's a way to set up an associative array if you have Bash 4: Bash: How to convert a number into a month string? 0. :) – You need to use date twice, once to convert from the string input to an 'epoch time' (the number of seconds since The Epoch — aka 1970-01-01 00:00:00 +00:00), and once to convert an epoch time to an output format of your choosing: How to convert string to number in bash. But I want command must consider both input('1600000. My answer address precisely this and offer way to process this operation repetitively, usinf and efficient and system friendly method. Ask Question Asked 10 years, 3 months ago. Bash script need to convert string to date. It's one line and without any complicated constructs, using just simple built in jq features. ty @GiovanniNunes is it possible that bash is going to add support for float in the future? map array Ask questions, find answers and collaborate at work with Stack Overflow for Teams. @yundongxu The cat command reads the data piped into standard input which is a string of binary digits. Bash - I need a shell script program to print the hexadecimal number from big endian to little endian. You can also do the same thing explicitly with the Number function. Input: my virtual address = 00d66d7e; Output: 7e6dd600; How can I can I create this in a bash script? Bash: Convert a string (version number) to an integer. For instance java has java. You can't always depend on the presence of tools like bc. abc_2, abc_1, You can convert a number to integer though by using the binary or operator for instance Bash: Convert a string (version number) to an integer. Let's look at some examples of how to convert a string to a number in Bash: 1. For general-purpose padding whether the string is numeric or not. numfmt --grouping 12343423455. Convert number to different number in batch file. Extracting positive/negative floating-point numbers from a string. If your system has them, hd (or hexdump -C) or xxd will provide less surprising outputs - if not, od -t x1 is a POSIX-standard way to get byte-by-byte hex output. Second thing, bash doesn't know scientific notation (even for integers).