What happens if I don't specify an exit code In Linux any script run from the command line has an exit code. share|improve this answer edited Mar 17 '12 at 19:37 gatoatigrado 7,654445102 answered Jan 29 '09 at 22:07 Vladimir Graschenko add a comment| up vote 16 down vote for bash: # this share|improve this answer edited Nov 23 '13 at 0:28 answered Oct 16 '11 at 21:50 Keith Thompson 8,69232235 3 Note that the semicolon is important. –Thorbjørn Ravn Andersen Oct 17 Reply Link Poonam August 20, 2008, 8:22 amI tried to find out, but did not find anything. http://jscience.net/exit-code/bash-return-code-check.html
error_msg="ERROR : Failed to run the command \"$cmd\" with the output \"$msg\" !!!" [ $ret_cmd -eq 0 ] || doLog "$error_msg" doLog " DEBUG : cmdoutput : \"$msg\"" } #eof func with bash: The exit codes are provided in the PIPESTATUS special array. All rights reserved. It's not, if nothing goes wrong.
One thing I have noticed is sometimes scripts use exit codes and sometimes they don't. share|improve this answer answered Sep 18 '08 at 6:09 Allen 4,0111428 21 What does it do? eval '[ "$?" = 127 ] || exit '"$?" Which basically allows you to expand the initial value for $? Last Exit Code Destiny cmd1 exit code is in $pipestatus, cmd3 exit code in $pipestatus, so that $?
The Linux Documentation Project has a pretty good table of reserved exit codes and what they are used for. Bash Script Exit On Error Did Malcolm X say that Islam has shown him that a blanket indictment of all white people is wrong? This is Bash's way of giving functions a "return value." Following the execution of a pipe, a $? gives the exit status of command ] doesn't execute command; it treats command as a string and treats it as true because it has a non-zero length. [ is a synonym for the test command –Keith
Second order SQL injection protection A bit, a nibble or bite? Exit Code 0 only gives you the return code of the last element in the pipe so, in the code: ls -al file.ext | sed 's/^/xx: /" will not return an error code if Run it as follows: chmod +x finduser.sh ./finduser.sh Sample Outputs: Enter a user name: vivek User 'vivek' found in /etc/passwd file. What is an asymmetric wheel and why would you use it?
Testing for exit codes Earlier we used the $? And i want to exit with the actual spd-say exit code (it may not be 0). Bash Set Exit Code This should be changed to [ $rc -ne 0 ]. Bash Neq An AND list has the form command1 && command2 command2 is executed if, and only if, command1 returns an exit status of zero.
b. this contact form You usually want something like if ls -al file.ext; then : nothing; else exit $?; fi which of course like @MarcH says is equivalent to ls -al file.ext || exit $? Written by Benjamin Cane on 2014-09-02 14:45:00| 4 min read Lately I've been working on a lot of automation and monitoring projects, a big part of these projects are taking existing I am running Ubuntu Dapper Drake Linux.Keep it coming, it is good stuff.Rob Reply Link Rob April 3, 2007, 6:59 pmG'day again,Nope, I was wrong the script works I didn't copy Exit Bash Shell
While this is a working solution to the problem, there are more clever methods that will save us some typing. Bash Exit On Error share|improve this answer answered Sep 18 '08 at 6:09 Allen 4,0111428 21 What does it do? No more, no less. - As thoroughly debated with you and explained there, all three suggestions in the other answer are well defined by POSIX.
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share|improve this answer edited Sep 18 '08 at 6:20 answered Sep 18 '08 at 6:10 Jeff Hill 41.7k3116 1 This should really be the top answer: it's much, much easier EDIT: I forgot to mention that i prefer a POSIX-complaint solution for better portability.
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