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Using the apropos command – even if you have to fix it first

On Linux, the apropos command helps identify commands related to some particular term. It can be helpful in finding commands you might want to use—especially when you can’t remember their names.

For example, if you couldn’t remember the command to display a calendar or put your shell to sleep for a short period of time, you could try these commands:

$ apropos calendar
cal (1) – display a calendar
$ apropos sleep
sleep (1) – delay for a specified amount of time
usleep (1) – sleep some number of microseconds

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Source:: Network World – Data Center