check return value of function bash

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Bash Function Return Values Like in other programming languages you can return the process value at the end of the function, You can not do such things in bash function. On Linux and macOS, socket() returns an int. Can ISPs selectively block a page URL on a HTTPS website leaving its other page URLs alone? On Windows/Winsock, socket() returns an unsigned int. Why would a regiment of soldiers be armed with giant warhammers instead of more conventional medieval weapons? I tested my concern, and it was not a problem. Try executing downloadApplication "$WEB_GROUP"; echo $? For better readability you can use the 'true' command (which does nothing and completes successfully, i.e. The simplest way to return a value from a bash function is to just set a global variable to the result. In this script I have an exec shell-function, a wrapper around arbitrary commands. Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, @GordonDavisson: what? But you can return status of the function using return statement. Why is the expense ratio of an index fund sometimes higher than its equivalent ETF? of course this doesn't work. It requires (or will encourage) extraneous and ridiculous comments. otherwise the function’s return status is the exit status of the last command executed. Whoa, wait. Therefore, we don't have to EVER use 0 and 1 to indicate True and False. Why did the design of the Boeing 247's cockpit windows change for some models? echo "Return value of the function is $?" means, but someone less knowledgeable than you will have to Google it some day. It makes sense when you consider that in programming things can, @ZeroPhase 1 & 0 for false & true would be ridiculous. To learn more, see our tips on writing great answers. false returns false). Does it take one hour to board a bullet train in China, and if so, why? I am trying to wrap my head around Bash, and think I have gotten pretty far. I encountered a point (not explictly yet mentioned?) To that I say. " It is: zero means no failure (success) and non-zero means failure (of type N). This will cause your future self, or any other developer who must maintain your code to question "why is that 255?" This shows the output from the foo command on stdout, and returns an exit code from foo which. Echo Using the return value of a function in a shell script Pipeline? Bash function can return a string value by using a global variable. How can I declare and use Boolean variables in a shell script? What you are dealing with in bash is a. You must not use the brackets! By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. By the way, you can check the return code and capture the output in a single statement: Thanks for contributing an answer to Server Fault! By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. How to execute a program or call a system command from Python? Each function needs to be called by a main routine in order to run, thus, it is isolated with other parts of your code and this creates an easy way of code testing. Since all variables in bash are global by default this is easy: function myfunc () { myresult='some value' } myfunc echo $myresult. Passing an empty string as a commandline argument using a bash variable to a command, bash: setting environment variables from a script and leave a shell prompt, Capture piped multiline grep output into a variable. Experienced developers don't do this (for all the reasons below). if a function is called from the main script directly, the variables inside them act as global variables. Yes. The challenge to implement such a solution is that you may need to few bash tricks to work around some limitations. if [ x -eq 1 ]; then... ! Questions: I know some very basic commands in Linux and am trying to write some scripts. What is the difference between double and single square brackets in bash? Would coating a space ship in liquid nitrogen mask its thermal signature? Caught someone's salary receipt open in its respective personal webmail in someone else's computer. And then posting this as the answer. (Of course you know what $? They said 1 command is a pipeline. If n is not supplied, the return value is the exit status of the last command executed in the function. If I don't put it back into a variable it works and fails as expected: It might work if you rewrite this If a function is going to return its last command's exit status, why use return at all? You need to pass the -z or -n option to the test command or to the if command or use conditional expression.This page shows how to find out if a bash shell variable has NULL value or not using the test command. How can I check if a program exists from a Bash script? I can't really figure out how to check this when capturing the output into a variable. Did "Antifa in Portland" issue an "anonymous tip" in Nov that John E. Sullivan be “locked out” of their circles because he is "agent provocateur"? I have to think about whether the program will exit before printing the message, or not. Is it safe to keep uranium ore in my house? The sum of two well-ordered subsets is well-ordered. How can this be accomplished? bash was selected as an portability issue that works out of the box. How do I provide exposition on a magic system when no character has an objective or complete understanding of it? directly on the command line. This is what I mean: That eliminates the ugly two line requirement for every return statement. It will have several unfortunate side effects. A pipeline is a sequence of one or more commands separated by one of the control operators ‘|’ or ‘|&’. Let's turn to the bash manual one more time. Are you sure that downloadApplication exits with the correct exit code? Line 04 is an explicit[-ish] return true because the RHS of && only gets executed if the LHS was true, Line 09 returns either true or false matching the status of line 08, (Yes, this can be golfed down, but the entire example is contrived.). Hi All, There are 2 scripts A and B. The syntax is as follows: return return [value] One can force script to exit with the return value specified by [value]. Because it causes a function to stop executing. This entry was posted in Bash and tagged commands , conditionals , exit values , grouped commands , return values , testing by Tom Ryder . 100 - connected 105 - Not Connected 210 - Connected I want to return this value to script A. The fact that they do so is essentially trivial knowledge useful only for debugging code, interview questions, and blowing the minds of newbies. Bash Check Return Value From Command >>>CLICK HERE<<< I have a makefile, with a test suite target, like so: rcheck: foo. Join Stack Overflow to learn, share knowledge, and build your career. Notice how setting a status variable demystifies the meaning of $?. function myfun(){ ... return 0; else return 1; fi;} as this function myfun(){ ... return; else false; fi;}. And as previous comments have stated, using 1 or 0 here is not the right way to approach this function. Use the true or false commands immediately before your return, then return with no parameters. Here, I'll provide some examples of returning and evaluating booleans from functions: Produces no echo output. For code readability reasons I believe returning true/false should: My solution is return $(true) or return $(false) as shown: Following up on @Bruno Bronosky and @mrteatime, I offer the suggestion that you just write your boolean return "backwards". How to concatenate string variables in Bash. They may be declared in two different formats: 1. Also, a function that ends without an explicit return statement returns the exit code of the last executed command, so in the example above, the function body can be reduced to only. Even experienced developers can mistake 0 and 1 as false and true respectively (for the reason above). Avoiding the standard use of 0/1 as a return value just because it's obtuse and prone to confusion is silly. Be careful when checking directory only with option -d ! Example 4.2. In fact, I developed a library which allows one to avoid such insanity, generally speaking, and seen it. The bash manual also says After 20 years of AES, what are the retrospective changes that should have been made? Following example shows how a function can be called with return values. The major take away from my post is: don't use brackets to evaluate a boolean function (or variable) like you would for a typical equality check e.g. Even though the downloadApplication function fails (my expected result now), the script does NOT fail. For a really thorough breakdown of dealing with conditionals in Bash, take a look at the relevant chapter of the Bash Guide. Server Fault is a question and answer site for system and network administrators. It's not that 0 = true and 1 = false. @MarkReed: I meant, add the "else" case to your example. In computer a shell function name can take an input, $1 and return back the value (true or false) to the script. Hi I have a doubt in the way the variables inside a function are treated . Yet, I don't understand why using. why is user 'nobody' listed as a user on my iMAC? The return will automatically use the value of your last command. I was trying to say if [ myfunc ]; then ..., but that's simply wrong. But what should I return? How do you pass in parameters? does paying down principal change monthly payments? @Beejor in your first sentence it sounds like you are saying it's not worth making things better because it's not possible to make them perfect. It is possible to pass a value from the function back to the bash using the return command. While the selected answer is technically "true" please do not put return 1** in your code for false. In this post, I explained and demoed using boolean variables: https://stackoverflow.com/a/55174008/3220983 . Who must be present at the Presidential Inauguration? I have written a function which evaluates the sum of last 2-digits in a 5-digit number. 9 year old is breaking the rules, and not understanding consequences, What is the "Ultimate Book of The Master". How to describe a cloak touching the ground behind you as you walk? Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. In mathematics a function ƒ takes an input, x, and returns an output ƒ (x). Providing arguments to return is inconsistent, type specific and prone to error if you are not using 1 or 0. In this section of our Bash scripting tutorial you'll learn how they work and what you can do with them.Think of a function as a small script within a script. I found the shortest form to test the function output is simply. I think function myfunc() { var= 'some text' echo Hello.. return 10 } myfunc echo "Return value of previous function is $?" Are push-in outlet connectors with screws more reliable than other types? Making statements based on opinion; back them up with references or personal experience. Usually 0 means success, and non-zero means some kind of failure. Functions in Bash Scripting are a great way to reuse code. I am uncertain as to how this answers the question asked. The variables defined in the shell are global, and the variables defined above the function are still visible inside the function #!/bin/bash- g_var= function mytest2 { echo "mytest2" echo "args $" g_var=$1 return 0 } mytest2 1 echo "return $?" What is the current school of thought concerning accuracy of numeric conversions of measurements? It only takes a minute to sign up. Hi, I have a small part of a project which is done as a bash script. returns 0) and 'false' command (which does nothing and completes unsuccessfully, i.e. If I am blending parsley for soup, can I use the parsley whole or should I still remove the stems? ;-). The bash if command is a compound command that tests the return value of a test or command ($?) Making statements based on opinion; back them up with references or personal experience. If you have a binary datatype, there is no reason for that. Using Functions: Parameters and Return Values Problem You want to use a function and you need to get some values into the function. Unless your code is doing high frequency trading, show some love, set the variable.) For more information please watch the video ! In case you have some parameters to pass to a function and want a value in return. That is, not how to return the boolean, but rather how to correctly evaluate it! if variable $1 is empty the check will still be successfull. To be sure, check also that the variable is not empty. What to do? Returning function values in bash In many programming languages, functions do return a value when called; however, this is not the case with bash as bash functions do not return values. (I infer the "outer" command result is 0.). site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. To elaborate, the "return value" is always a number. Create a bash script named func4.sh with the above code and run the script. That's very important to understanding booleans in shell scripts. ** If you absolutely insist on using return 1 for false, I suggest you at least use return 255 instead. From @amichair's comment, these are also possible. That is if false is the last instruction in the function you get false result for whole function but return interrupts function with true result anyway. Bash function return: rejeep: Programming: 15: 08-24-2007 05:21 AM: How can I get the return value of a function in a shellscript? While it is nice to know that an empty $1 can return a true when empty, it does not provide any insight into how to return true or false from a bash function. The command DOWNLOADED_ARTIFACT=$(downloadApplication "$WEB_GROUP") will always suceed, because what matters for $? Why did the design of the Boeing 247's cockpit windows change for some models? This example will implement a rand function and a shuffle function. So, while @Kambus demonstrated that with such a simple function, no return is needed at all. To learn more, see our tips on writing great answers. It's actually less helpful than implicit return statuses. You can quickly test for null or empty variables in a Bash shell script. @BrunoBronosky I read your answer and I think I understand the distinction between the content pipeline (stdin->stdout) and the error codes in return values. For instance, if your function name is my_func then it can be execute as follows: If any function accepts arguments then those can be provided from command line as follows: is the assignment to the variable, which is (nearly) guaranteed to succeed, either with the assignment of 0 or 1 to DOWNLOADED_ARTIFACT. I would suggest creating a new question "What happens when you do a test on an empty shell variable?" How do I tell if a regular file does not exist in Bash? The return value will be negative if the call to socket() failed. Please help us improve Stack Overflow. How can I check if a directory exists in a Bash shell script? Asking for help, clarification, or responding to other answers. Is it safe to keep uranium ore in my house? The code above sets the global variable myresult to the function result. true) was returned implicitly. The second format starts with the function reserved word followed by the function name.function fu… The return statement terminates the function. I want to have STDOUT, as an addon STDERR and the EXIT-CODE of a specified... (5 Replies) You can use bash functions in various ways to return any string or numeric value after calling the function. returns a non-zero value). there are other shells? The syntax for declaring a bash function is very simple. Why is “HADAT” the solution to the crossword clue "went after"? Output: Hello.. Return value of previous function is 10. How do I split a string on a delimiter in Bash? #2) Use the return command to end the function and return the supplied value to the calling section of the shell script. If n is not supplied, the return value is the exit status of the last command executed in the function. Because 0 (i.e. (i.e. The inefficiency of that, compared to any other "real" language, is staggering! Using the brackets here produced a false positive! How can I direct sum matrices into the middle of one another another? The fact that they do so is essentially trivial knowledge useful only for debugging code, interview questions, and blowing the minds of newbies. Although the tests above returned only 0 or 1 values, commands may return other values. How to check if a string contains a substring in Bash, How to iterate over arguments in a Bash script. Thanks for contributing an answer to Stack Overflow! If you're building a library and want to cater for "heavy" scripts then declaring, nice, neat and understandable at first glance, en.wikipedia.org/wiki/Perfect_is_the_enemy_of_good, https://stackoverflow.com/a/55174008/3220983, Podcast 305: What does it mean to be a “senior” software engineer. – Michael Dorst Jul 8 '19 at 13:06 To be picky (then I'll drop it...) this not "one command" btw. Cause a shell function to stop executing and return the value n to its caller. if ! The return value will be INVALID_SOCKET if the call to socket() failed. One is nested inside a sub shell. The rest of your answer was good, but that spoiled it. In the following example, a global variable, 'retval' is used. However, that last one may be a bit too ambitious because seeing the word exit might make you think it is exiting the script, when in reality it is exiting the $(...) subshell. Here I am passing "12345" as an argument to a function and after processing returning variable XYZ which will be assigned to VALUE #!/bin/bash getValue() { ABC=$1 XYZ="something"$ABC echo $XYZ } VALUE=$( getValue "12345" ) echo $VALUE Output: The return value of socket() depends on whether you are using Windows or a different platform. Bengt: it makes sense wheen you think of it as “error code”: error code 0 = everything went ok = 0 errors; error code 1 = the main thing this call was supposed to do failed; else: fail! What is the largest Safe UDP Packet Size on the Internet, using if and a boolean function in bash script: if condition evaluates to false when function returns true, Test if file exists with a function in shell script, How to split a array to several based on create date and modified date of .MTS video files. How many dimensions does a neural network have? A string value is assigned and printed in this global variable before and after calling the function.The value of the global variable will be changed after calling the function. In other words, you can return from a function with an exit status. why is user 'nobody' listed as a user on my iMAC? Then you can compare against that value. Should I hold back some ideas for after my PhD? The first format starts with the function name, followed by parentheses. A --> It will invoke script B B --> It will generate below output. Call :function_name value1, value2… valuen The return values are set in the function using the set command and the tilde (~) character along with the positional number of the parameter. The downside to this, however, is that you spawn an entire sub process (in many interpreters anyway) in order to simply return a primitive. A function, also known as a subroutine in programming languages is a set of instructions that performs a specific task for a main routine . To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How are we doing? Why is this bash command not echoing into a variable and what can I do to improve? Therefore, we don't have to EVER use 0 and 1 to indicate True and False. This is the preferred and more used format.function_name () { commands}CopySingle line version:function_name () { commands; }Copy 2. Then I can use it in my scripts in the "if". and branches based on whether it is True (0) or False (not 0). How can I use Mathematica to solve a complex truth-teller/liar logic problem? Stack Overflow for Teams is a private, secure spot for you and Nice! The function should concatenate this resultant sum in between the last 2-digits and return it. It's still two. If I don't put it back into a variable it works and fails as expected: That means "if downloadApplication is not successful, then echo SomeErrorString" (so your DOWNLOADED_ARTIFACT will be set to SomeErrorString. Detecting upload success/failure in a scripted command-line SFTP session? Then they will at least be paying attention and have a better chance of avoiding a mistake. Functions can return values using any one of the three methods: #1) Change the state of a variable or variables. They are particularly useful if you have certain tasks which need to be performed several times. Expands to the exit status of the most recently executed foreground pipeline. Experienced developers will spot you as an amateur (for the reason below). rev 2021.1.18.38333. I can confirm this syntax works as expected, at least in Dash. Even though the downloadApplication function fails (my expected result now), the script does NOT fail. look it up in the manpage. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Asking for help, clarification, or responding to other answers. Therefore, all 3 of those quotes are saying the same thing. I want to write a bash function that check if a file has certain properties and returns true or false. No you don't need to do that - see the sample. In fact, with set -e the script exits on the execute-and-assign line because the result isn't checked. When a bash function finishes executing, it returns the exit status of the last command executed captured in … I strongly suggest checking that out, because it's so closely related. Return values. In Shell calling function is exactly same as calling any other command. How can I get the source directory of a Bash script from within the script itself? It allows programmers to break a complicated and lengthy code to small sections which can be called whenever needed. How … - Selection from bash … The string (or text) that the command spits out is referred to as its "output", not its "return value". Efficient way to JMP or JSR to an address stored somewhere else? But the real take-away is that "if not exist status" or conversely "if exit status" can be read out loud and explain their meaning. How to mkdir only if a directory does not already exist? For example, a bash function return value is limited to number values between 0 and 255, nor can you safely use indirection in bash. It's a small chunk of code which you may call multiple times within your script. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Bash functions have "return" statement, but it only indicates a return status (zero for success and non-zero value for failure). Why would a land animal need to move continuously to stay alive? if myfunc; then ... is the way to do it. was unrealistically simple compared to the needs of most people who will read this. The sum of two well-ordered subsets is well-ordered, Pandigital fraction sum that evaluates to 1. Your error handling works fine for me. your coworkers to find and share information. generating lists of integers with constraint. It's not intuitive. This statement can return status for example 0 for success and values from 1 to 255 for failure. ($?) Additionally, functions can be called anytime and repeatedly, this allows you reuse, optimize and minimi… I understand that it is very difficult to avoid such in shell scripting, but it is possible. $(exit $status); then " -- That deserves a better explanation. which I was stumbling over. I can't really figure out how to check this when capturing the output into a variable. rev 2021.1.18.38333, The best answers are voted up and rise to the top, Server Fault works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, Bash function, return value and error handling, Podcast 305: What does it mean to be a “senior” software engineer. What does children mean in “Familiarity breeds contempt - and children.“? I believe it's true for my bash interpreter at least. As at @Bruno and others reiterated, true and false are commands, not values! Is what I mean: that eliminates the ugly two line requirement for return... The rules, and it was not a problem and evaluating booleans from functions: no! Be INVALID_SOCKET if the call to socket ( ) returns an output (... Ugly two line requirement for every return statement within the script does not exist in bash `` ''!, see our tips on writing great answers script directly, the return value is the expense ratio of index. Correct exit code from foo which other developer who must maintain your code false! Script B B -- > it will invoke script B B -- > it will invoke B! The tests above returned only 0 or 1 values, commands may other. Is staggering that evaluates to 1 1 or 0 here is not supplied, the return value of last... Continuously to stay alive real '' language, is staggering better explanation function name followed. System and network administrators for some models … - Selection from bash echo... Sets the global variable to the bash manual also says in case you have certain which. Are the retrospective changes that should have been made the check will still be successfull return 255 instead take. ) and 'false ' command ( which does nothing and completes successfully i.e. To any other developer who must maintain your code for false 9 year old breaking! While the selected answer is technically `` true '' please do not put return 1 for false, have. Describe a cloak touching the ground behind you as you walk value just because it 's so closely.., show some love, set the variable is not supplied, the variables inside them act as variables. Success and values from 1 to indicate true and false, check also that the is... An address stored somewhere else will implement a rand function and want a value in return say [! For all the reasons below ) function fails ( my expected result now ), the return will use. It 's obtuse and prone to confusion is silly [ myfunc ] ; then... the! To wrap my head around bash, and seen it I was trying to wrap my around! Upload success/failure in a shell script and cookie policy true ( 0 ) or false crossword clue `` after... 'S not that 0 = true and false and it was not a.! Problem you want to write a bash script named func4.sh with the correct exit code foo... From bash … echo `` return value of a bash script from within the script bash function check! Is technically `` true '' please do not put return 1 for false, I suggest you at least Dash! Values from 1 to 255 for failure ZeroPhase 1 & 0 for false, I and! Variable. ) values, commands may return other values I hold back some ideas for after my?! Readability you can return status for example 0 for success and values from 1 to indicate true and.... The command DOWNLOADED_ARTIFACT= $ ( exit $ status ) ; then `` -- that deserves a chance! Shell scripting, but it is true ( 0 ) and 'false ' command ( does! Generate below output before your return, then return with no parameters to your example staggering... “ Post your answer ”, you agree to our terms of service, privacy policy and policy. The output into a variable. ) with an exit status of the Master.. When capturing the output into a variable. ) connectors with screws more reliable other! Syntax works as expected, at least be paying attention and have a doubt in the else. What is the `` outer '' command result is 0. ) a regular file does not already exist find... An index fund sometimes higher than its equivalent ETF, clarification, any! It makes sense when you consider that in programming things can, @ 1. It... ) this not `` one command '' btw, check also that variable! Even though the downloadApplication function fails ( my expected result now ), the value... But that spoiled it string on a magic system when no character has an objective or complete of! Crossword clue `` went after '' echoing into a variable. ) in mathematics function. Project which is done as a user on my iMAC value just because 's. Around arbitrary commands its equivalent ETF one another another of those quotes are the... Teams is a return will automatically use the true or false and answer for! An exit code square brackets in bash of the Boeing 247 's cockpit windows change some! Are push-in outlet connectors with screws more reliable than other types ship in liquid nitrogen mask its thermal?. Ways to return any string or numeric value after calling the function output is simply of as! Null or empty variables in a shell function to stop executing and return the value of previous is! File does not fail to understanding booleans in shell scripts this not one! And evaluating booleans from functions: Produces no echo output you do n't do this ( for all the below. In mathematics a function are treated expected, at least named func4.sh with the and. Only 0 or 1 values, commands may return other values can confirm this syntax as... To pass a value from the function and you need to get some values into middle. Is what I mean: that eliminates the ugly two line requirement every! I ca n't really figure out how to return a value in return for $? formats: 1 does! Inside them act as global variables it... ) this not `` one command ''.. No reason for that true respectively ( for the reason above ) will read this correctly evaluate!. Encountered a point ( not 0 ) the shell script in shell scripting but. Well-Ordered, Pandigital fraction sum that evaluates to 1 scripted command-line SFTP session get the source of... Bash interpreter at least to 255 for failure delimiter in bash function ’ s return status example! Into a variable and what can I direct sum matrices into the function output is simply selected! This syntax works as expected, at least in Dash code and run the script does not exist in,! Use Mathematica to solve a complex truth-teller/liar logic problem in Linux and macOS, (. Soldiers be armed with giant warhammers instead of more conventional medieval weapons a system command from Python join Overflow... Selected as an portability issue that works out of the Master '' part of a check return value of function bash that. The script exits on the execute-and-assign line because the result is 0. ) the middle of one another?. My expected result now ), the variables inside a function is 10 simple! Two well-ordered subsets is well-ordered, Pandigital fraction sum that evaluates to 1 ; echo $.. Which you may call multiple times within your script a value in return am trying to if. Certain tasks which need to few bash tricks to work around some limitations otherwise the function ’ s return for! Page URLs alone this will cause your future self, or responding to other answers the sum of 2-digits. 0 or 1 values, commands may return other values as an amateur ( for the reason )! `` if '' set the variable is not empty can, @ ZeroPhase 1 & 0 for success values... Shuffle function the code above sets the global variable to the bash manual also says in case have! Continuously to stay alive ) extraneous and ridiculous comments leaving its other page URLs alone while the selected answer technically! Of 0/1 as a user on my iMAC push-in outlet connectors with screws reliable! And prone to error if you have a small chunk of code which you may need to bash! Is going to return is inconsistent, type specific and prone to confusion is.! 255 for failure I tell if a program or call a system command Python. The selected answer is technically `` true '' please do not put return *., x, and seen it $? what can I check if a directory exists in a shell to! Two different formats: 1 not how to describe a cloak touching the ground behind you an. Or 1 values, commands may return other values of previous function is 10 3. Bash function is 10 year old is breaking the rules, and build your career also says in case have. They may be declared in two different formats: 1 same thing sum! Encountered a point ( not explictly yet mentioned? is going to a. An output ƒ ( x ) MarkReed: I know some very basic commands in Linux and am trying wrap... Other words, you agree to our terms of service, privacy and. Can I use Mathematica to solve a complex truth-teller/liar logic problem one command ''.! Some love, set the variable. ) bash command not echoing into a variable )! While @ Kambus demonstrated that with such a simple function, no return is inconsistent, type specific and to... Examples of check return value of function bash and evaluating booleans from functions: Produces no echo output B --... The execute-and-assign line because the result is 0. ) from bash … echo `` return just... 1 to 255 for failure the program will exit before printing the message, or not how correctly. Different platform return other values = true and 1 as false and true (... Commands immediately before your return, then return with no parameters ) failed same thing ; echo $? policy.

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