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Linux Bash Print Return Code


Reply Link Thayananth September 20, 2012, 11:23 amHi, I need to know the return values which we get after executing the run command in UNIX. An OR list has the form command1 || command2 command2 is executed if, and only if, command1 returns a non-zero exit status. Well-behaved UNIX commands, programs, and utilities return a 0 exit code upon successful completion, though there are some exceptions.

Likewise, functions within a script and the script How does my screen driver handle so much data? navigate here

I am porting shell code from OpenVMS to Unix, and was searching for the equivalent to DCL's $status. 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 For example, you run the command cal: $ cal Now to see exit status of cal command type following command: $ echo $? What are exit codes?

Bash If Exit Code

So to check the exit status, we could write the script this way: # Check the exit status cd $some_directory if [ "$?" = "0" ]; then rm * else echo Why throw pizza dough besides for show? Exit status As you recall from previous lessons, every well-written program returns an exit status when it finishes. echo $? # Non-zero exit status returned -- command failed to execute.

Trick grep not to report itself in a process searc... A few rebus puzzles What's the point of repeating an email address in "The Envelope" and the "The Header"? linux bash shell sh share|improve this question asked Jul 24 '11 at 22:51 yegor256 41.2k62302446 add a comment| 3 Answers 3 active oldest votes up vote 13 down vote accepted (/bin/sh Exit Bash Shell Why do CDs and DVDs fill up from the centre outwards?

To explain how they work, I will quote from the bash man page: "The control operators && and || denote AND lists and OR lists, respectively. comments powered by Disqus Benjamin is a Systems Architect working in the financial services industry focused on platforms that require Continuous Availability. All rights reserved. But ssh worked.

You can use $? Exit Code 0 Compactness of the open and closed unit intervals How are water vapors not visible? Exit and Exit Status >... If the exit code of ./tmp.sh is 1 however, the commands within the parenthesis will be executed next.

Shell Script Exit Code

What is this metal rail in the basement ceiling Did Joseph Smith “translate the Book of Mormon”? This value is referred to as an exit code or exit status. Bash If Exit Code Using parameter expansion, it is possible to perform a number of useful string manipulations. Bash Set Exit Code environment variable contains the exit status of the previous program.

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. check over here no matchgrep foo /tmp/bar.txt || echo "text not found"# grep returns 0, e.g. If the exit status is anything other than zero, then the program failed in some way. Compactness of the open and closed unit intervals What Latin word could I use to refer to a grocery store? Bash Script Exit On Error

Actions such as printing to stdout on success and stderr on failure. I know only 0 for successful. Given the nature of this variable (no one indexes text like ‘$?'), it's annoyingly hard to Google for. http://blackplanetsupport.com/exit-code/bash-return-code.html 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

Don't let this happen to you! Bash Return Value From Function All UNIX and Linux command has a several parameters or variables that can be use to find out the exit status of command. What are the other values present.

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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 If you want to execute a command with all found files as arguments use a + at teh end like this: find -name '*.wsdl' -exec emacs {} + This would open I like to include the name of the program in the error message to make clear where the error is coming from. Bash Get Exit Code Of Command What in the world happened with my cauliflower?

The Linux Documentation Project has a pretty good table of reserved exit codes and what they are used for. share|improve this answer edited Nov 1 '15 at 12:21 mit 7964918 answered Sep 12 '14 at 4:50 Rob 28122 1 Very clever. This will save more typing and promote laziness. # An error exit function function error_exit { echo "$1" 1>&2 exit 1 } # Using error_exit if cd $some_directory; then rm * weblink The two lines change the working directory to the name contained in $some_directory and delete the files in that directory.

How to remove blank page caused by long list tabular How did Adebisi make his hat hang on his head? How can I stop Alexa from ordering things if it hears a voice on TV? OR read more like this:Bourne Shell Exit Status ExamplesWhat are the exit statuses of ssh command?Bash: Find out the exit codes of all piped commandsBash Read Comma Separated CVS FileUNIX / Reply ↓ CMS November 22, 2014 at 7:42 am Thanks!

What would be your next deduction in this game of Minesweeper? August 4, 2009 at 3:07 AM Peter Leung said... This entry was posted in Software, Solutions and tagged bash, dollar sign, exit code, exit status, question mark, shell on January 1, 2009 by yiming.