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Unix Shell Script Exit On Error

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Bash Script Exit On Error

exit from bash shell script on error up vote 285 down vote favorite 49 I've been writing some shell script and I would find it useful if there was the ability to halt the execution of said shell script if any of

Bash If Exit Code

the commands failed. See below for an example: #!/bin/bash cd some_dir ./configure --some-flags make make install So in this case if the script can't change to the indicated directory then it would certainly not want to do a ./configure afterwards if it fails. Now I'm well aware that I could have an if check for each command (which I think is a hopeless solution), but is there a global setting to make the script exit if one of the commands fails? bash shell exit share|improve bash catch error this question edited Mar 29 '15 at 23:26 asked May 20 '10 at 4:21 radman 5,72462242 I did have a quick look for duplicates and couldn't find any. –radman May 20 '10 at 4:22 1 answer goes to Adam for the detail regarding set -e (which is exactly wanted). Also thanks to a_m0d for the info on traps (though not 100% relevant). –radman May 20 '10 at 5:07 add a comment| 7 Answers 7 active oldest votes up vote 454 down vote accepted Use the set -e builtin: #!/bin/bash set -e # Any subsequent(*) commands which fail will cause the shell script to exit immediately Alternatively, you can pass -e on the command line: bash -e my_script.sh You can also disable this behavior with set +e. (*) Note: The shell does not exit if the command that fails is part of the command list immediately following a while or until keyword, part of the test in an if statement, part of a && or || list, or if the command's return value is being inverted via ! (from man bash) share|improve this answer edited Jan 19 '15 at 16:52 Gilead 91711322 answered May 20 '10 at 4:36 Adam Rosenfield 243k66374494 1 Is this also a Bourne Shell builtin? –Tom May 16 '12 at 19:03 3 @Tom Yes: See pubs.opengroup.org/onlinepubs/009695399/utilities/… –Max Nanasy Aug 3 '13 at 20:50 2 'Set +e' will revert the setting again, so you can have only certain blocks that exit automatically on errors. &ndas

Ramey

The exit command terminates a script, just as in a C program. It can also return a value, which is available to the script's parent process.

Every command returns an exit status

Linux Kernel Error Codes

> (sometimes referred to as a return status or exit code). bash if exit code not 0 A successful command returns a 0, while an unsuccessful one returns a non-zero value that usually can be interpreted as an error code. Well-behaved UNIX commands, programs, and utilities return a 0 exit code upon successful completion, though there are some exceptions.

Likewise, functions within a script and the script itself return an exit status. The last command http://stackoverflow.com/questions/2870992/automatic-exit-from-bash-shell-script-on-error executed in the function or script determines the exit status. Within a script, an exit nnn command may be used to deliver an nnn exit status to the shell (nnn must be an integer in the 0 - 255 range).

When a script ends with an exit that has no parameter, the exit status of the script is the exit status of the last command executed http://www.tldp.org/LDP/abs/html/exit-status.html in the script (previous to the exit).

#!/bin/bash COMMAND_1 . . . COMMAND_LAST # Will exit with status of last command. exit

The equivalent of a bare exit is exit $? or even just omitting the exit.

#!/bin/bash COMMAND_1 . . . COMMAND_LAST # Will exit with status of last command. exit $?

#!/bin/bash COMMAND1 . . . COMMAND_LAST # Will exit with status of last command.

$? reads the exit status of the last command executed. After a function returns, $? gives the exit status of the last command executed in the function. This is Bash's way of giving functions a "return value." [1]

Following the execution of a pipe, a $? gives the exit status of the last command executed.

After a script terminates, a $? from the command-line gives the exit status of the script, that is, the last command executed in the script, which is, by convention, 0 on success or an integer in the range 1 - 255 on error.

Example 6-1. exit / exit status

#!/bin/bash echo hello echo $? # Exit status 0 returned because command executed successfully. lskdf # Unrecognized command. echo $? # Non-zero exit status returned -- command failed to execute

here for a quick overview of the site Help Center Detailed answers to any questions you might have http://unix.stackexchange.com/questions/97101/how-to-catch-an-error-in-a-linux-bash-script Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other shell script Un*x-like operating systems. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How to catch an error in a linux bash script? up vote 5 down vote favorite 1 I made the following script: # !/bin/bash shell script exit # OUTPUT-COLORING red='\e[0;31m' green='\e[0;32m' NC='\e[0m' # No Color # FUNCTIONS # directoryExists - Does the directory exist? function directoryExists { cd $1 if [ $? = 0 ] then echo -e "${green}$1${NC}" else echo -e "${red}$1${NC}" fi } # EXE directoryExists "~/foobar" directoryExists "/www/html/drupal" The script works, but beside my echoes, there is also the output when cd $1 fails on execution. testscripts//test_labo3: line 11: cd: ~/foobar: No such file or directory Is it possible to catch this? bash shell shell-script error-handling share|improve this question edited Oct 22 '13 at 22:58 Gilles 374k706831129 asked Oct 22 '13 at 10:29 Thomas De Wilde 28114 Just an FYI, you can also do this a lot simpler; test -d /path/to/directory ( or [[ -d /path/to/directory ]] in bash ) will tell you whether a given target is a directory or not, and it will do it quietly. –Patrick Oct 22 '13 at 12:36 @Patrick, that just tests if it's a directory, not if you can cd into it. –Stéphane Chazelas Oct 2

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