Locate the binary, source, and manual page files for a command.
# To locate binary, source and man pages for ssh:
whereis <ssh>
# To locate binary and man pages for ls:
whereis -bm <ls>
# To locate source of gcc and man pages for git:
whereis -s <gcc> -m <git>
# To locate binaries for gcc in /usr/bin/ only:
whereis -b -B </usr/bin/> -f <gcc>