whereis — Locate the bin, src & man page for a file.
Summary :
whereis locates source/binary and manuals sections for specified files. whereis will attempts to locate the desired program in a list of standard Linux places.
Example:
$ whereis ls — Display the bin, src(if avail) and man page locations.
$ whereis -b ls — Show only bin file location.
$ whereis -m ls — Show only man page location.
$ whereis -s ls — Show only source file location.
$ whereis -u -M /usr/share/man/man1 -f route — Find the bin file location and search for man page in only man1 dir.
$ whereis -u -M /usr/man/man1 -S /usr/src -f * — Find all files in /usr/bin which are not documented in /usr/man/man1 with source in /usr/src.
Read: man whereis