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.\"     from: @(#)which.1	6.3 (Berkeley) 4/23/91
.\"
.Dd February 21, 1997
.Dt WHICH 1
.Os
.Sh NAME
.Nm which
.Nd "locate a program file (or files) in the path"
.Sh SYNOPSIS
.Nm which
.Op Fl a
.Ar name Op Ar ...
.Sh DESCRIPTION
.Nm
takes a list of names and looks for the files which would be
executed had these names been given as commands.
Each argument is searched for along the user's path.
.Pp
If the
.Fl a
flag is given,
.Nm
will return a list of all matches instead of just the first match.
.Pp
The
.Nm
utility exits with one of the following values:
.Pp
.Bl -tag -width 4n -compact
.It 0
All names were successfully resolved.
.It 1
Some names were resolved but not all.
.It 2
No names were resolved.
.It \-1
A system error occurred.
.El
.Sh DIAGNOSTICS
A diagnostic is given if an executable file with the argument
name was not found in the path.
.Sh ENVIRONMENT
The following environment variables affect the execution of
.Nm which :
.Bl -tag -width PATH
.It Ev PATH
A colon-separated list of directories in which to find executables.
If
.Ev PATH
is not set, and the given name is not a fully qualified
or relative pathname,
.Nm
will fail.
.El
.Sh SEE ALSO
.Xr csh 1 ,
.Xr find 1 ,
.Xr locate 1 ,
.Xr sh 1 ,
.Xr whereis 1 ,
.Xr environ 7
.Sh HISTORY
A
.Nm
command appeared in
.Bx 3.0 .
.Sh CAVEATS
The
.Nm
command formerly was a
.Xr csh 1
script and could expand aliases.
.Xr csh 1
now has a built-in
.Nm
command so this version is intended for use
with other shells like
.Xr sh 1 .