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Get The Exit Status Code For The Last Command

The exit code for the last thing run can be seen with the variable :

bash 
$?

Zero is the standard value that gets returned if the preceedeing process was successful. Any non - zero numbers mean it failed in some way.

Example usage

bash 
echo $?

Being able to use ` $? [TODO: Code shorthand span ] is one reason why it's a good idea to return proper exit status codes from any command line apps you write.