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It is not a POSIX parameter - but is fairly portable to any modern, interactive shell. Thanks :) –jwbensley Mar 26 '11 at 23:11 4 Wouldn't the exit code returned by test() always return 0 in case of an error since the last command executed was I would like to do something like this: echo "trying stuff" try { command1 command2 command3 } And at any point, if any command fails, drop out and echo out the It is very important to check the exit status of programs you call in your scripts. http://sovidi.com/error-code/bash-126-error-code.php

no outgoing connection via ipv4 How to map and sum a list fast? The problem with the script was that it did not check the exit status of the cd command before proceeding with the rm command. For a simple script like that it should be pretty easy to have it working in both zsh and bash. To check the exit code we can simply print the $?

Bash Exit Status Variable

What does the "Phi" sign stand for in musical notation? All rights reserved. What are the canonical white spaces? share|improve this answer edited Jul 25 '13 at 20:19 geirha 21.3k84653 answered Jul 25 '13 at 13:57 choroba 4,19411321 This is not a correct answer. $?

If you have the ability to modify these commands, I'd edit them to yell on failure, rather than wrap them in something else that does so. It's not, if nothing goes wrong. Integral using residue theorem complex analysis Force Microsoft Word to NEVER auto-capitalize the name of my company What type of sequences are escape sequences starting with "\033]" more hot questions question Bash Check Error Code Of Last Command Problem?

Using exit codes in your bash scripts While removing the echo command from our sample script worked to provide an exit code, what happens when we want to perform one action Bash Get Last Exit Code share|improve this answer edited Jun 14 '15 at 5:34 answered Jun 14 '15 at 1:03 mikeserv 37k341109 add a comment| up vote 8 down vote There are various options to handle Reply Link Erik February 15, 2016, 2:40 pm$ ssh localhost “./cyberciti; echo $?” Did you notice it was all in quotes? COMMAND_LAST # Will exit with status of last command.

only exists within the current shell; if you want it available in subprocesses then you must copy it to an environment variable. Bash Error Code 255 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 Reply Link davb March 6, 2013, 4:05 pmActually, rather than grep “^”"$USR”"$”, just use grep -w $USR ….easy! Anyway…The reason you get an exit code of "0" on that last one is that ssh was successful in connecting to localhost and executing your command.

Bash Get Last Exit Code

Execution: $ ./tmp.sh Could not create file $ echo $? 1 Using exit codes on the command line Now that our script is able to tell both users and programs whether It contains the current # line number. Bash Exit Status Variable Aborting." 1>&2 exit 1 fi Here we check to see if the cd command is successful. Bash Get Exit Code Of Last Command I like to include the name of the program in the error message to make clear where the error is coming from.

What type of sequences are escape sequences starting with "\033]" Which requires more energy: walking 1 km or cycling 1 km at the same speed? weblink 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 Is it possible to check for existence of member template just by identifier? Is it possible to do that without a temporary variable? Bash Script Last Command Status

A more general solution is to store the output in a variable: result=$(find -name '*.wsdl') emacs $result This works with all commands, not just find. Why? Yes, of course I'm an adult! navigate here Next, if command makes decision based upon exit status stored in OUT variable.

That's what is meant by i want to exit only if the first command is found (exit code != 127) and is a specified return for command when the command it Bash Error Code Of Previous Command if [[ -z $BG ]]; then "[email protected]" else "[email protected]" & fi # Check if command failed and update $STEP_OK if so. It's free: ©2000-2016 nixCraft.

test 1 -ne $? && exit $_ Use $_, which expands to the last argument of the previous command.

if [[ $EXIT_CODE -ne 0 ]]; then STEP_OK=$EXIT_CODE [[ -w /tmp ]] && echo $STEP_OK > /tmp/step.$$ if [[ -n $LOG_STEPS ]]; then local FILE=$(readlink -m "${BASH_SOURCE[1]}") local LINE=${BASH_LINENO[0]} echo "$FILE: No more, no less. - As thoroughly debated with you and explained there, all three suggestions in the other answer are well defined by POSIX. Unix & Linux Stack Exchange works best with JavaScript enabled ≡ MenuHomeAboutLinux Shell Scripting TutoriaLRSS/FeednixCraftLinux and Unix tutorials for new and seasoned sysadmin.Shell: How to determine the exit status of Linux Bash Error Code Handling Advanced Bash-Scripting Guide: PrevNext

Chapter 6.

command -p sudo; then exit; fi which would have the same results for your example. –jordanm Jun 13 '15 at 13:44 ok, what if i want to test for Reply Link mike July 18, 2008, 4:54 amim a newbie in AIX platform. This is Bash's way of giving functions a "return value." [1]

Following the execution of a pipe, a $? gives the exit status of his comment is here and then running bunch of commands in a .sh script , how to stop the script if something fails? 0 How to check return value from a ninja parallel build?

I know only 0 for successful. Although since that would be run from within your interactive shell, you may want to use $$ rather than $PPID. Natural construction Video displays in Star Wars How to book a flight if my passport doesn't state my gender? Browse other questions tagged bash shell zsh exit-code or ask your own question.

share|improve this answer answered Jun 13 '15 at 15:21 Scott 3,75821328 add a comment| up vote 0 down vote To answer your direct question, no, it's not possible to keep $? So sayeth the Shepherd Dennis numbers 2.0 What to tell to a rejected candidate? Script: #!/bin/bash touch /root/test 2> /dev/null if [ $? -eq 0 ] then echo "Successfully created file" else echo "Could not create file" >&2 fi In the above revision of our If the exit status is anything other than zero, then the program failed in some way.

in (1) ... ;; (127) ... ;; (*) echo $? ;; esac with the special case asked in the question: command -p sudo ... Negating a condition using !

true # The "true" builtin.