NAME
whereis —
    locate programs
SYNOPSIS
| whereis | [ -a] name ... | 
DESCRIPTION
The whereis utility checks the standard
    binary directories for the specified name, printing
    out the paths of any it finds that are executable by the user.
The path searched is:
/usr/bin:/bin:/usr/sbin:/sbin:/usr/X11R6/bin:/usr/local/bin:/usr/local/sbin
If the -a flag is given,
    whereis will return a list of all matches instead of
    just the first match.
EXIT STATUS
The whereis utility exits with one of the
    following values:
- 0
- All names were successfully resolved.
- 1
- Some names were resolved but not all.
- 2
- No names were resolved.
SEE ALSO
HISTORY
The whereis command first appeared in
    2BSD, but the original version was legally tainted
    and was not included as part of the 4.4BSD release,
    such that most of the original functionality was lost.
The -a option first appeared in
    OpenBSD 2.3.
AUTHORS
The original version was written by Bill Joy.