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aawineco
Junior Member
USA
31 Posts |
 Posted - Feb 01 2008 : 09:50:09 AM
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found it:
Exit codes are a number between 0 and 256, which is returned by any Unix command when it returns control to its parent process.
Other numbers can be used, but these are treated modulo 256, so exit -10 is equivalent to exit 246, and exit 257 is equivalent to exit 1.
These can be used within a shell script to change the flow of execution depending on the success or failure of commands executed.
Success is traditionally represented with exit 0; failure is normally indicated with a non-zero exit-code. This value can indicate different reasons for failure.
For example, GNU grep returns 0 on success, 1 if no matches were found, and 2 for other errors (syntax errors, nonexistant input files, etc).
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exit status codes
