Day 38 - Exit code
In a shell, you can get the exit code of the last command executed, using the variable $? (or ${?}).
Examples:
$ bash -c 'exit 42'
$ echo $?
42
$ ls /foobar
ls: /foobar: No such file or directory
$ echo $?
1
$ pwd
/Users/samuelberthe/project/github.com/devops-tip-of-the-day/_posts
$ echo $?
0