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Unix Return Code Checking


$? reads the exit status of the last command

should return the sudo exit status, but instead it always returns 0 (the exit code of the test). Also rc=$? The command itself failed. Remove advertisements Sponsored Links Franklin52 View Public Profile Find all posts by Franklin52

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command1; then - much more succinct! –jwbensley Jul 10 '15 at 18:50 @pzkpfw it's easy to test, try it out :) Bash treats && and some other syntax as Any link to docs please? –Swaroop C H Sep 18 '08 at 6:15 1 @SwaroopCH set -e your script will abort if any command in your script exit with error That is, the program's ability to handle situations in which something goes wrong. Just want to ask how to execute this command: #!/bin/bash Reply Link Poonam August 5, 2008, 12:16 pmCan you tell me what ist he difference between return status of 1 and

Bash If Exit Code

In that case, the cd command will fail and the script executes the rm command on the current working directory. If you're just asking out of simple curiosity, then the answer is no. EDIT: I forgot to mention that i prefer a POSIX-complaint solution for better portability. echo $status if [ $status -ne 0 ]; then echo "error with $1" >&2 fi return $status } function run_command() { exit 1 } check_exit run_command share|improve this answer answered Oct

The last command executed in the function or script determines the exit status. Exit status As you recall from previous lessons, every well-written program returns an exit status when it finishes. The step as a whole fails if any individual # command fails. # # Example: # step "Remounting / and /boot as read-write:" # try mount -o remount,rw / # try Bash Set Exit Code Let foo be a function that does not "return" (echo) a value, but it sets the exit code as usual.

If you mean you want the script to terminate as soon as any command fails, then just do set -e at the start of the script. Thanks :) –jwbensley Mar 26 '11 at 23:11 5 Wouldn't the exit code returned by test() always return 0 in case of an error since the last command executed was Second order SQL injection protection How can I slow down rsync? All UNIX and Linux command has a several parameters or variables that can be use to find out the exit status of command.

is always the same as $pipestatus[-1]. Bash Return Value From Function or anything like: pipefail -o command1 "arg1" "arg2" | command2 "arg1" "arg2" | command3 Because the arguments of each command I believe (correct me if I'm wrong) will interfere with each Another approach is to do this: set -e set -o pipefail If you put this at the top of the shell script, it looks like bash will take care of this Nor was portability mentioned anywhere in the question, thus i gave a answer that works in said shell.

Shell Script Exit Code

Using them, we can see how the $? directly. Bash If Exit Code local EXIT_CODE=$? Bash If Exit Code Not 0 You can read more about parameter expansion in the bash man page under the topic "EXPANSIONS".

up vote 159 down vote If you want to work with $?, you'll need to check it after each command, since $? http://jscience.net/exit-code/unix-get-return-code-of-last-command.html Changed it accordingly. –geedoubleya Oct 21 '14 at 21:36 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using in (1) :;; (*) echo $?;; esac All those options have the advantage that they are conforming to the POSIX standard. (Note: For illustration I used echo commands above; replace by more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Bash Script Exit On Error

Could human beings evolve to have longer gestation periods? Reply Link Erik February 15, 2016, 2:40 pm$ ssh localhost “./cyberciti; echo $?” Did you notice it was all in quotes? I know only 0 for successful. http://jscience.net/exit-code/how-to-get-return-code-in-unix.html Second order SQL injection protection Delete new kernels /boot full How can I slow down rsync?

You can also get the entire list to process as you see fit: pax> false | true | false; echo ${PIPESTATUS[*]} 1 0 1 If you wanted to get the largest Exit Bash Shell To know the exit status of the elements of a pipeline cmd1 | cmd2 | cmd3 a. Please note that these parameters or variables may only be referenced assignment to them is not allowed.

COMMAND_LAST # Will exit with status of last command.

$? reads the exit status of the last command

In other matters, you should always quote all references to shell variables unless you have a good reason not to, and you're sure you know what you're doing. But anyway, since you appear to be testing whether or not the command sudo can be found in the shell's builtin -p portable path string with command, I would think you more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Exit Code 0 Aborting" rm * If an exit is not required in case of error, then you can even do this: # Another way to do it if exiting is not desired cd

share|improve this answer answered May 3 '15 at 22:12 niieani 1,1511417 add a comment| up vote 2 down vote Sorry that I can not make a comment to the first answer How do I make the shell script exit if any of the commands exit with a non-zero exit code? Useful info and explained well! check over here echo "Example of error with line number and message" error_exit "$LINENO: An error has occurred." The use of the curly braces within the error_exit function is an example of parameter expansion.

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