which Command
  
  
  Purpose
  
  Locates a program file, including aliases and paths.
  
   Syntax
  
  which [ Name ... ]
  
  Description
  
  The which command takes a list of program names and looks for the
  files that run when these names are given as commands.  The which
  command expands each argument, if it is aliased, and searches for
  it along  the  user's path.  The aliases and paths are taken from
  the .cshrc file in the user's home directory.  If the .cshrc file
  does not exist, or if the path is not defined in the .cshrc file,
  the which command uses the path defined in the user's environ-
  ment.
  
  A diagnostic is given if a name is aliased to more than a single
  word or if an executable file with the argument name is not found
  in the path.
  
  In the  Korn shell, you can use the whence command to produce a
  more verbose report.  See " Korn Shell Special Commands" in AIX
  Version 3.2 System User's Guide: Base and Devices for more infor-
  mation on the whence command.
  
  Examples
  
  To find the executable file associated with a command name of
  lookup:
  
  which lookup
  
  Implementation Specifics
  
  This command is part of Base Operating System (BOS) Runtime.
  
  Files
  
  \~/.cshrc	Source of aliases and path values.
  
  Related Information
  
   Shells Overview in AIX Version 3.2 System User's Guide: Base and
  Devices describes shells, the different types, and how they af-
  fect the way commands are interpreted.
  
   Commands Overview in AIX Version 3.2 System User's Guide: Base
  and Devices.
  
  The  csh command,  find command,  file command,  ksh command,  sh
  command,  whereis command.