Purpose and typical usage of /etc/rc.local

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http://unix.stackexchange.com – The header looks like this: #!/bin/sh -e # # rc.local - executed at the end of each multiuser runlevel # # Make sure that the script will "exit 0" on success or any other # value on error. What is the reason for this file (it does not contain much), and what commands do you usually put in it? What is a "multiuser runlevel"? (I guess rc is "run commands"?) (HowTos)