osf1 man page for which

which(1)						      General Commands Manual							  which(1)

NAME
       which - Locates a program file including aliases and paths

SYNOPSIS
       which program...

DESCRIPTION
       The which command takes a list of program names and looks for the files that would be executed if these names were given as commands.

       Each  program  argument is expanded if it is aliased and searched for along your path.  Both the aliases and path are taken from your file.
       If you do not have a file, the path is the current PATH from your environment.

       The which command is written in csh script language and only works in the C shell. The ksh program offers the built-in  commands  type  and
       whence that perform the same function as which.	The sh built-in command type can also be used.

FILES
       Read at beginning of execution by each shell.

DIAGNOSTICS
       A diagnostic is given if an executable file with the argument name was not found in the path.

SEE ALSO
       Commands:  whereis(1)

																	  which(1)