Linux command line reference for common operations.

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apropos whatis
Show commands pertinent to string. See also threadsafe
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man -t man | ps2pdf - > man.pdf
make a pdf of a manual page

which command
Show full path name of command

time command
See how long a command takes
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time cat
Start stopwatch. Ctrl-d to stop. See also sw
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nice info
Run a low priority command (The "info" reader in this case)
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renice 19 -p $$
Make shell (script) low priority. Use for non interactive tasks