WHEREIS: Search For Files
whereis searches a directory tree or the entire disk for specified files.
whereis filespec
Searches the entire disk for files matching filespec. filespec can contain ? and * wildcards.
whereis directory filespec
Recursively searches directory and all its subdirectories for files matching filespec. filespec can contain ? and * wildcards.
whereis can take a long time when searching a large disk. Restricting the search by specifying a directory can cut it way down.