whereis - locate the binary, source, and manual page files for a command.
Display the location of binary, source, and manual page files for a command:
whereis gimp
Display the location of binary :
whereis -b ls
Display the location of manuals :
whereis -m chmod
Display the location of sources :
whereis -s chown
Display the paths that whereis uses for search:
whereis -l
Display command names with unusual entries:
whereis -m -u *