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Check Return Code Bash Script


$? reads the exit status of the last command

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

Reply Link Security: Are you a robot or human?Please enable JavaScript to submit this form.Cancel replyLeave a Comment Name * Email * Comment You can use these HTML tags and attributes: Related Posts Bash command existence Calculating with Bash Cron best practices This entry was posted in Bash and tagged commands, conditionals, exit values, grouped commands, return values, testing by Tom Ryder. After a function returns, $? gives the exit status of the last command executed in the function. Run it again: chmod +x finduser.sh ./finduser.sh Sample Outputs: Enter a user name: tommy User 'tommy' not found in /etc/passwd file.

Bash Set Exit Code

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[1], cmd3 exit code in $pipestatus[3], 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." [1]

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?

Bash Script Exit On Error

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

more hot questions question feed lang-bsh about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Browse other questions tagged bash shell or ask your own question. To explain how they work, I will quote from the bash man page: "The control operators && and || denote AND lists and OR lists, respectively. have a peek here You can see this work with the following: [me] $ true; echo $? 0 [me] $ false; echo $? 1 The true and false commands are programs that do nothing except

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.

COMMAND_LAST # Will exit with status of last command.

$? reads the exit status of the last command

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Check This Out I know only 0 for successful.

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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