Published at LXer:
Occasionally as seasoned Linux users, we run across simple things we never knew existed—and are amazed. Whether it's tab autocompletion, sudo !! for when you forgot to type sudo or even recursive file listing with ls, the smallest tricks can be so incredibly useful. Not long ago, I had one of those moments. Most people know rc.local is the file where you put commands you want to have start on system boot. Sometimes the rc.local script is disabled, however, and it doesn't work. It also can be difficult to remember the syntax for starting a particular program as a specific user. Plus, having a long list of programs in rc.local can just become ugly. Little did I know, cron supports not only periodic execution of commands, but it also can start programs when the system starts as well!
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