Shell Scripting Exit(s)

liguorir · 04-21-2004, 10:24 AM

What's the difference between

exit 0

and

exit 1

in shell scripting?

Technoslave · 04-21-2004, 10:42 AM

Off the top of my head, it has to do with how the script has finished. I can't recall off the top of my head, but an exit 0 means that it quit successfully, and a 1 means there was an error.

Do a search for exit status shell or something like that in google, you should be able to find a better answer than mine :-D

mfeat · 04-21-2004, 10:57 AM

you can exit any code you want, the calling program can then access the return code as $?

example:

run_some_script

if [ $? -ne 0 ]; then
echo script failed
...
fi

elluva · 04-21-2004, 10:59 AM

Your answer was actually correct. When you run a program (or a script), it has an exit status. This is just an integer =/< 0. When running exit 0 in a shell script, you just set the shell variabel $? on 0. You can then use this in lets say an if:

Code:

if yourscript
then
  #Your exit status was 0
  do_something
else
  #Your exit status was > 0
  dosomeotherthing
fi

It is also possible to just 'echo $?', this will give you the exit status of last program run.