Bash compare float to integer. This is not an integer.

Bash compare float to integer Consider floats as strings Floating point comparison in shell (7 answers) Closed 9 years ago. 1. 0f) and float_to_comparable_integer(-0. 1f\n" The formatting options of printf are similar. . Floating-point numbers: Numbers that contain decimals. 45, 3. 66. 1 # This test has For simple calculations on floating point numbers (+-*/ and comparisons), you can use awk. Compare floating point numbers using regex in Bash. 56, 54,64and so on. g if I do echo '4. Posted by vikas_singh (Linux My if expression always evaluates to TRUE somehow. Here's what the man page says: expr1 {=, >, >=, <, <=, !=} expr2. About; Products Lots of the above solutions take you from there, but it all derives from the observation that version string is just an integer with an arbitrary base. ) and get integer value which you can compare. bash can't handle floating-point arithmetic at all; zsh can, but only in an arithmetic command like (( a1 < 0. If you compare those as floating point, you get "3. But you should use -eq 1 because == in bash is to compare strings – Romeo Ninov. *}${#num}" ] But case is usually best case Specifically, there are two sets of integer comparison operators: square brackets and double parenthesis. Regular expression to capture both integer and float in bash. as the difference was calculated in bash in your original script. for coul in 5 6 7; do mkdir cc I want to compare a floating point variable to an integer. i try to validate if a Bash's < and > compare strings, -lt and -gt compare integers, the only way to compare floating point numbers is to shell out to bc(1) Neither shell has an integer type. When you give number1=2 Notably, when the decimal part is exactly 0. If you need to compare that the value are close enough to each other, use an epsilon like instead of == Ever found yourself puzzled when trying to compare numbers in Bash? You're not alone. Commented Mar 11, How can I compare two floating point numbers in Bash? 6. Detect python version in As others have indicated, bash does not have built-in floating-point operators. In my testing I have not been able to recreate this issue. Comparing float values in bash. Or, you can use bc comparison and return value: Actually I need a bash shell script to do that. – Hashim Aziz Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site You can do it with two sed expressions, one for trailing zeroes after the dot, the other for those after a non-zero digit. Let’s see some examples: $ bash round_to_integer. 22. #!/bin/bash floor_val= ceil_val= function floor() { float_in=$1 floor_val=${float_in/. 21. 12 < 3. Viewed 95k times @glennjackman I'm actually not sure if everyone who tags bash knows the difference between bash and simply sh. Bash: switch from integer to float. I am currently performing a simple arithmetic problem that involves a floating integer. You could also use your favorite command line language (awk, python, perl, etc). 12. First, we analyzed why Bash doesn’t accept floating point numbers. Handling Floating-Point Numbers. 234 500 In bash shell, how do we judge if a Here, number could be an integer or a float. Hot Network Questions How is "no self" (Anatta) supposed to be a helpful? @Sigur I believe this is because bash doesn't natively support floating point maths . 2. I'm doing exactly this in my project, shellmath, in three basic steps: Break the numbers down into their integer and bash doesn't handle floating point numbers, only integers. In Bash, there are mainly two types of numbers: Integers: Whole numbers without any decimal points. lang. In Bash, how do I declare a local integer variable, i. If you want to compare floating point numbers, you need an external tool like bc. Commented Jun 28, How can I compare two floating point numbers in Bash? 112. I know that bash by itself does not do arithmetic with floating integers. In this Using echo "20+5" literally produces the text "20+5". a == b always return true if the value of a is exactly equal to b, i. Although if you want to do simple comparison i. False. *} } function ceiling() { float_in=$1 ceil_val=${float_in/. Bash: comparing a string as an integer. In bash scripting, the arithmetic expansion operator is a simple but very powerful Comparing an integer and floating point in bash. But the problem you will run into is precision. The paper is a challenging read for a non-mathematician, but the key points are well stated in between the heavy swaths of math backing them up. No one else has cited it yet, and I haven't linked to it in a while, so here is the classic paper on the scary edges of floating point representation and arithmetic: What Every Computer Scientist Should Know About Floating Point. It's not entirely clear, but I think you're asking how to convert a floating-point value (myduration) to an integer in bash. You can compare multiple numbers and even handle floating-point numbers, albeit with a bit more finesse. Bash has only integer math; you need to use a tool other than bash (such as awk) to do floating-point. " --> I tried this with float_to_comparable_integer(+0. (Commenting for reference). 0)) prints 0:(. Unfortunately, Bash doesn’t support floating point arithmetic. 9 how I get it to truncate/use floor to get 2. *; class FloatTest { private When I inquired about the reasoning I was told that the [[test could potentially choke trying to compare numbers with leading zeros. Thanks. I remember that there are a way to convert in to int without rounding. In one variable, I get a floating point value. 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. Return the results of integer comparison if both arguments are integers; otherwise, returns the results of string comparison using the locale-specific collation sequence. – Similarly to the solution with awk, you can use printf with bash too, e. sh: line 9: [: missing `]' I don't have any idea what I'm doing wrong. These arithmetic binary operators return true if arg1 is equal to, not equal to, less than, less than or equal to, greater than, or greater than or equal to arg2, respectively. Comparison in floating-point types works the same as in integer types for normal types. *} Note that if you used this code to try to turn an integer into an integer it would return the same number so you can apply this to any number you get regardless of whether or not it is a decimal. 05 )). I don't know which shell you're using, but there is two solutions. Comparing the integer using IF condition in bash script. Something like this may help you, depending on which way you want to round your number. 345 < 12. util. Bash compare string vs integer not working. Zsh does support float values. ROTATION variable is 0. However, this is easier (much easier!) because you're comparing to integer constants. 5. 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 am a new student to bash scripting, and I am stumped on an assignment question. " Essentially, Bash variables are character strings, but, depending on context, Bash permits arithmetic operations and comparisons on variables. 35 | awk '{if ($1 < $2) print $1; else print $2}') Or, if you have ksh93 or In this article, we learned how to compare floating point numbers in Bash. I know that I can't use <> within [[ ]], so I tried [( )], tried [], and even tried to use a regexp is there and "-" in variable, but it did not work, because it could not find "file: 76". – jimmij. While Bash primarily works with integers, it also provides limited support for floating-point numbers. Bash comparison floating number. They are quite different, as in the former case you have to remove the dot as well. Asking for help, clarification, or responding to other answers. I need to sum them. 0) as illustrated by the loop below. Related. On top, (man bash) Quote: When used with [[, the < and > operators sort lexicographically using the current locale. e 12. See the Bash documentation, section "6. Commented Nov 5, 2015 at 19:25 | Show 3 more Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I am new to bash scripting. if two In this image, you can see that while giving input number1=10 and input number2=8, it shows that “Number1 is greater than number2” as it’s true. sh: line 6: [: 7]: integer expression expected . On most C/C++ implementations, float and int have the same size (4 bytes) and wildly different precision levels. Bash comparison. 14 INTEGER=${DECIMAL%. In this case maybe you can multiply by 10 or 100 (etc. Round the floating point number using the normal IEEE 754 implementation. It will convert it to a float. Despite producing floating point results, Bash does not support other type of arguments than integers, so you need to rather invoke external tools like bc for your math or stick to integers only. I was wondering if there is an easy way to determine whether a users' input is an integer or not. What command in Linux can rep In bash you can also use $((0xff)), i. That will round up (from x. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog This article will show you how to compare floating point number in bash. Hai, Can you please guide me, to compare the floating point numbers. If you need to use the floats, then as soon as I get into the office - which will be in an hour or so - I'll rewrite the code, using bc, which adds a couple of extra lines - and a few additional steps and processes to get your compares done. Convert float to integer in bash. integer ceiling_result ceiling_divide() { ceiling_result=$(($1/$2)) echo $((ceiling_result+1)) } ceiling_divide 1. If then echo "value1 is grater " fi This code is not working properly when i excuted with floating values or real numbers (13 Replies) 1. 3' | bc which outputs 2. Usually, we compare two integer numbers. io. – Can you compare a float and an integer, sure. More specifically, if a user is prompted to input an integer, is there a quick check to validate? Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. – konsolebox. 5) to the next integer. I tried to put double quotes around the variables and the numbers but did not work. For example, the following prints out true even though 2_000_000_001 does not equal 2_000_000_000:. *} ceil_val=$((ceil_val+1)) } float_val How do I compare float / real numbers in a shell script? Although the bash / bc solution would work fine, then “0. How should I write the comparison to work? Bash compare string vs integer not working. 345 == 12. Anyway, Or if there's a choice, you can use a better shell that does floating point, eg Zsh. 984” will appear to be a smaller integer than “0. 8" but it should be "3. For example, we have 2 numbers as follows: My search this morning was about how could I compare two decimal numbers in bash, and I came to this answser: How to compare to floating point number in a shell script. Look at I know that bash doesn't support floats, That seams to work but then in my while loops it says "integer expression expected" I am trying to have everything on bash How can I compare two floating point numbers in Bash? 42 "Invalid Arithmetic Operator" when doing floating-point math in bash. list in APT folder. You can implement floating-point in bash, even without using calculator programs like bc and awk, or any external programs for that matter. However, it's important to note that Bash's floating-point arithmetic may not be as precise as other programming languages, due to the way it handles decimal values. 8 < 3. 5 and 2. Here's the experiments I did at Adding 0 won't convert a string into an int. 1 Y=4. This would also solve the problem that the version can't really be compared with floating point numbers because of versions like: 3. I have a input file with set of float numbers like 2. From info expr < <= = == != >= >' Compare the arguments and return 1 if the relation is true, 0 otherwise. Rounding up float point numbers bash. txt | xargs -n 1 printf "%. 189 ]; which doesn't work because it wants 4. 5, printf rounds to the nearest even integer. 67 but expr is saying 0, because it doesn't support float. 000 or 90. 5 The rounded number: 2 $ bash Bash in itself is very flexible though. cat file. 8 3. via xargs:. bash does not natively handle floating point numbers, but you can call a utility such as bc From man bc - An arbitrary precision calculator language X=3. Stack Overflow. In zsh (which supports floating point arithmetic (decimal separator is always the period)), you have the rint() math function to give you the nearest integer as a float (like in C) In Bash scripting, numbers can be represented in different ways, such as integers, floating-point numbers, or even hexadecimal or octal values. Add a I could not find any single utility in bash which can do such comparison for versions or decimals or floating point numbes unless it is an integer. 320 The LC_NUMERIC is to ensure that numbers are Extract filename and extension in Bash Hot Network Questions Can equipment used in Alcohol distillation be used for the small-scale distillation of crude oil The OP's wants to convert the result into Integer but Bash doesn't have any data type like Integer. Modified 7 years, 1 month ago. Convert (integer,precision) pair to a float in bash/bc. 189 to be an integer, and if You can validate an integer value for $num like: [ "$num" -eq "$num" ] Or a float like: [ "${#num}${num#*. After reading the this article I understand that there is no straight way to do that. Compare variable with integer in shell? [duplicate] Ask Question Asked 11 years, 5 months ago. Bash itself can't use float. BUGS There are no I wanted to simulate a vending machine where you can buy things only if you throw 2€ inside. Not just <=, but even < isn't a numeric comparison operator in < at all, so it neither of them works even for integers, much less floating-point values. Viewed 3k times 0 . I get errors on my script as -le is only applicable to integers. What command can I use to get the numeric sum, 25 in this case? Also, what's the easiest way to do it just using bash for floating point? For example, echo $((3224/3807. (Despite not being part of that standard,< is sometimes used for lexicographic comparison, though it needs to be quoted to prevent it from Bash can absolutely handle floating points. 2-1. 8. Ask Question Asked 6 years, 7 months ago. 20. I can't round any numbers. Hot Network Questions Is the danger of space radiation overstated? Why does this switch have extra pins? Do I could do it like this if my awk command returned an integer: declare -i MAX_LOAD=10 declare -i L1=`cat /proc/loadavg | awk {'print $1'}` if How to compare float values in a shell script? Ask Question Asked 9 years, 2 months ago. ) * Procedures involving heavy-duty math operations, especially floating point arithmetic, arbitrary precision calculations, or complex numbers (use C++ or FORTRAN instead) "Identical to floating-point comparison when: One positive and one negative number, and you are using a signed integer comparison. Comparing two Hexadecimal values in C++. Commented Feb 10, 2017 at 16:59. 4. i. ==' is a synonym for ='. with C-like hex prefix instead of 16#, although N# is clearly more general. Since you want to compare to an integer anyway (specifically with a less than compare), you can just truncate off the decimal and Yes, your specific example is fine, since both 0 and 1 can be exactly represented as a float. Do you mean integers in base 10, or do you mean strings that represent non-integer real values? – William Pursell. Note that this is not true in general: there are many large int values that's can't be represented exactly as a float. 0f), yet the results did not equate. When not to use shell scripts * Resource-intensive tasks, especially where speed is a factor (sorting, hashing, etc. Note that printf (either for awk or bash) will output rounded value. We will begin by understanding the diverse numeric comparison operators such as equality, non-equality, and The solution is to either use only the integer part of the floats you are comparing (using -gt instead of > and -lt instead of <; that's good enough for my applications), or split the integer and decimal parts and compare them as integers separately. previoustoolboxuser (previous_toolbox_user) October 30, 2009, 6:32am Subject: [shellscript-l] Script to compare float number and integer. sh Enter a floating-point number: 1. something like: func() { local ((number = 0)) # I know this does not work local declare -i number=0 # this doesn't work either # other Skip to main content How to compare hexadecimal number with hexadecimal numbers in shell? Skip to main content. You just need more code, in order to manipulate, compare and do arithmetic. – Charles Duffy. compare a variable and an integer in bash. This solution works with any number of erm numbers on the same line and does NOT remove trailing zeroes from integers, as that would change the value. There are only contexts in which a string can be interpreted as an integer. Commented Dec 8, 2014 at 11:30. It works as long as i only enter integer values, but if i enter a character or a float it suddenly stop 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 know it's really stupid question, but I don't know how to do this in bash: 20 / 30 * 100 It should be 66. you are 'flooring' ie always rounding down. 2 when dividing 21/5. Provide details and share your research! But avoid . I have tried all possible combinations that I could find to compare a real and an integer, but they all seemed to fail. I then parse it with jq+tr and end up with what I assume to be a float. g. from 5 to 5. I know this is not the best to do with bash, but my whole script is already written in bash. 12". Bash is limited to integers less than ((2**63)-1) if compiled in 64 bits. Using the “$(())” Arithmetic Expansion Operator. 14 Understanding these distinctions is crucial for the next step: converting strings to numbers in Bash. 6566”, but if you compare the originals as strings (dictionary order), I'm trying to test if the is Ubuntu version is supported or not, and in case if it is not, then I update source. His example showed integers as well and he wants an integer result. I am looking for answers using either the basic command shell ('command line') itself or through using languages that are In this tutorial, we are going to delve into the key aspects that revolve around comparing numbers in bash. So I am In Bash, two integers can be compared using conditional expression. import java. comparison of integer and floating point numbers in shell script. Compare non integers with if. $number can be Check also rounding up float in bash to a decimal and how to round floating point numbers in shell – fredtantini. bash integer number only. e this method, nice as it is, only works with integers. Try using one of the dc or bc solutions instead. arg1 OP arg2. Viewed 2k times This is not an integer. 000, a float value or it seems so ROTATION="$ bash can handle only integers. At least bash supports hexadecimal integers directly, provided that they are prefixed with 0x: $ [[ 0xdead -lt 0xcafe ]] Hex compare in bash scripting. *; import java. Could use some rewording to account for that. OP is one of -eq, -ne, -lt, -le, -gt, or -ge. Hi all, I have a problem in one of my scripts. In any case, the -eq operator exists to perform comparison between integers, not float (even in Zsh). Eg. 45 10. I have tried the following: if [ $? -eq 4. If someone could tell me how to fix it I would be thankful, sorry for my poor English I hope you guys can understand me. Bash only works on integers. 5. 1? Skip to main content. string variable to turn to an integer variable. To convert a string into an integer, you can use the arithmetic expansion operator $(()). 3. prints yoyo2) but it shoudl have gone into the third one and printed yoyo3. When I try to compare that float in terms of higher, lower or equal than, it doesn't work. Many developers find themselves in a maze when it comes to Bash’s built-in comparison operators only work with integers. I made a basic script to pull the price of a crypto asset off an API that returns a json payload. floating point number comparison in bash script. 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 Visit the blog expr will perform an integer or string comparison, not a floating-point comparison. How do I convert my floating point value to integer via a The code when executed for a directory of size 3318222 goes into the second elif block (i. Floating point results in Bash integer division. Modified 4 years, Bash's arithmetic expansion does not support floating-point calculations. For instance: integer_value=42 float_value=3. – 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 This is one way to turn decimals to integers in bash: DECIMAL=3. That will be the only difference with bc which does not have such limit Is there any way to compare such strings on bash, e. This link "How to judge a variable's type as string or integer" seems to only work i Skip to main content. Someone please suggest how to cast the strings as integers and do a comparison. I have a string that represent a float: Bash only has integers, no floats. Choose the one you prefer: avoid an external dependency or manipulate real floats. Comparing more than two numbers in Bash This article will show you how to compare floating point number in bash. 345 but 12. expr' first tries to convert both arguments to integers and do a numeric comparison; if either conversion fails, it does a lexicographic comparison using the character collating sequence specified by the `LC_COLLATE' locale. Compare 2 common numbers. 0. To Bash returns value 4 instead of 4. Format the number as a string for output. Commented Feb 6, 2015 at 16:24. Arg1 and arg2 may be positive or negative integers. Then I use -le to an Integer value. /bilet. Then, we looked at the bc, awk, and sort commands to get the floating Bash scripting allows for comparisons beyond just two numbers. Commented Feb 6, 2015 at 15:56. min=$(echo 12. }" -ne "${num%. 0f" 2743410360. Bash doesn't do floating point comparisons. : 2. 5 Shell Arithmetic": Bash doesn't support float values. comparing a number with a variable in shell if command. Modified 9 years, 2 months ago. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog How do I truncate a floating point number using bc e. My Question There's no floating point in bash. 346. Ask Question Asked 4 years, 9 months ago. For integer comparison, it's [[ 3 -lt 2 ]] or (( 3 < 2 )). I wish it had a good suppporting when handling integers and floating point numbers – Kiran. bc is the standard unix system tool for doing arithmetic or comparisons using floating point numbers. 8 and 2. You'll need a tool like bc to properly assign the value of result: result=$(bc -l <<<"${NUM}*${MEGA}") Setting variable to floating integer value. Unlike many other programming languages, Bash does not segregate its variables by "type. Bash - Math: Returns integer instead of float. Here are my shared experiences while working with the Linux system. . Bash provides built-in mechanisms to handle I'm trying to compare an integer and a floating point in bash script. e. Hot Network Questions When making a batch cocktail how do I preserve the carbonation To round a floating point number in the shell, based on standard floating point arithmetic, we need three steps: Convert the input text from a command line argument to a standard floating point number. See the POSIX test specification for the list of operators guaranteed to work in [. 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:. To get "round to next even integer" (Banker's rule), you need to use printf rounding: LC_NUMERIC=C printf "%. zzhoek lcr zkel zxrn hlis tejsol uilgxc rqlrk zmjf eouutqs