whereis

Locate the binary, source, and manual page files for a command. More information: https://manned.org/whereis.

• Locate binary, source and man pages for ssh:
  whereis {{ssh}}
• Locate binary and man pages for ls:
  whereis -bm {{ls}}
• Locate source of gcc and man pages for Git:
  whereis -s {{gcc}} -m {{git}}
• Locate binaries for gcc in /usr/bin/ only:
  whereis -b -B {{/usr/bin/}} -f {{gcc}}
• Locate unusual binaries (those that have more or less than one binary on the system):
  whereis -u *
• Locate binaries that have unusual manual entries (binaries that have more or less than one manual installed):
  whereis -u -m *