UNIX : Miscellaneous commands
- env : print or alter environment variables
- hostname : display host name
- man topic : display on-line manual on topic.
- screen : create multiple screen with one physical screen. This program is useful if you have a text-only (e.g. vt100) terminal. Move around with control-A.
- uname : print system name
- users : display all users on-line
- w : check who is doing what
- which commandname : show the location of commandname
- who : who is on-line on this machine
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