Wikipedia
Whereis
whereis, a Unix command, can locate some special files of a Unix command like the binary, source and manual page files.
The whereis man page provides the following sample usage:
% # Find all files in /usr/bin which are not documented in /usr/man/man1 with source in /usr/src: % cd /usr/bin % whereis -u -M /usr/man/man1 -S /usr/src -f *