man - Manuals. Built-in documentation for programs. From man -a intro: "Under Linux there are GUIs (graphical user interfaces), where you can point and click and drag, and hopefully get work done without first reading lots of documentation. The traditional Unix environment is a CLI (command line interface), where you type commands to tell the computer what to do. That is faster and more powerful, but requires finding out what the commands are."
SEARCH
man -f name
ADVANCED SEARCH - Results from descriptions and manual pagesman -k regexp
ALL - Queue matching pages from all sections
man -a name
PDF - Send PS output to a PDF file
man -t name | ps2pdf manPage.pdf
Of course, there's also the wonderful online versions at manpages.ubuntu.com.
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