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man

man formats and displays the system reference manuals. It provides access to documentation for commands, system calls, library routines, file formats, and other operating system components

Display short description about a command

man -f chmod

Display all related commands from a specific keyword

man -k chmod

Show File System Hierarchy

man hier

Show a manual for any program

man screen

Example 1: Dump all available man pages

man -k . | awk '{print $1}' | sort -u

Example 2: Dump alla vailable man pages (posix friendly)

manpath | tr ':' '\n' |
while read -r p; do
  find "$p" -type f -name '*.[0-9]*' -printf '%f\n'
done | sed 's/\.[^.]*$//' | sort -u

Dump manual page to stdout

man kbdinfo | col -bx

Copy a manual to your clipboard with xsel

man kbdinfo | col -bx | xsel --clipboard

Example 3: Dump all available man pages in a particular section"

find $(man --path | tr ':' ' ') -type f -path '*man2*' -exec basename {} \; | sed 's/\..*//' | sort