Each Linux command returns an exit code, with 0 indicating success and non-zero values indicating failure. You can use the $? variable to access the exit code and control program flow in scripts.

Yes, that’s the exit code and it’s meant to indicate that the pwd command you just used ran without any errors. An exit code of 0 always indicates that no problems were encountered.

Exit code numeric range The range of values for exit codes runs from 0 to 255. If you issue an “exit 256” command in a script and then check the exit status, you’ll notice that it’s equal ...