The exit status of a script is the exit status of the last command that was executed. set -o pipefail The bash shell normally only looks at the exit code of the last command of a pipeline. In the code, we have clearly mentioned that we if don’t find the file called lists.txt then we should set the errorlevel to 7. This is the value returns to parent process after completion of a child process. For example if the last statement tries to create a directory with mkdir some/path, and the command fails, then the exit code of the script itself will be the exit code of the failed mkdir.. If the exit code is a negative number, the resulting exit status is that number subtracted from 256. With Bash scripts, if the exit code is not specified in the script itself the exit code used will be the exit code of the last command run. To help explain exit codes a little better we are going to use a quick sample script. Here is most generic and accepted exit status codes.exit code is used to state command or script execution is completed succesfully. We can turn it off using the set +e command. 1 exit code is used to state that there are general errors like divide by zero etc. This behavior is not ideal as it causes the -e option to only be able to act on the exit code of a pipeline's last command. The exit code is a number between 0 and 255. In Linux any script run from the command line has an exit code. Not only that, but the whole script indicates success (its own exit code is set to be 0) even thought some part of it have failed. This can actually be done with a single line using the set builtin command with the -e option. Exit codes. Shell script with -e. We can set the -e either on the sh-bang line or with the set -e command. How "Exit Traps" Can Make Your Bash Scripts Way More Robust And Reliable. Knowing how to use exit codes, options such as errexit, and traps allow you to create robust scripts and better handle errors in bash. So, if your exit code is 20, then the exit status is 236. # exit when any command fails set -e Putting this at the top of a bash script will cause the script to exit if any commands return a non-zero exit code. There is a simple, useful idiom to make your bash scripts more robust - ensuring they always perform necessary cleanup operations, even when something unexpected goes wrong. Bash Exit Codes. Handling errors based on exit codes is the standstill method for detecting failure in a command. 2 exit code is used to state there is a misuse of the shell builtin. The exit code value return based on a command … You can also test the return code of a function which can be either an explicit return 3 or an implied return code which is the result of the last command, in this case you need to be careful that you don't have an echo at the end of the function, otherwise it masks/resets the previous exit code. In other words, it denotes the exit status of the last command our function. If the cmd process exits(as in the case you run the exit command in the cmd window or use “exit exitCode” in a bat script), the exitcode will be set to the exit code of the cmd process. 5 To produce an errant exit status of 0: $ bash $ exit 256 exit $ echo $? This is especially true in the case of external commands. Exit When Any Command Fails. 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