opensolaris man page for which

which(1)							   User Commands							  which(1)

NAME
       which - locate a command and display its pathname or alias

SYNOPSIS
       which [name]...

DESCRIPTION
       which takes a list of names and determines which alias or utility would be executed had these names been given as commands.

       For  each name operand, if it names an alias the alias is expanded. Otherwise the user's path is searched for a utility name matching name.
       Aliases are taken from the user's .cshrc file. path is taken from the current shell   execution environment.

OPERANDS
       The following operand is supported:

       name    The name of a command to be located.

EXIT STATUS
       The following exit values are returned:

       0      Successful completion.

       >0     One or more name operands were not located or an error occurred.

FILES
       ~/.cshrc    source of aliases and path values

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       csh(1), attributes(5)

DIAGNOSTICS
       A diagnostic is given for names which are aliased to more than a single word, or if an executable file with the argument name was not found
       in the path.

NOTES
       The which utility is not a shell built-in command.

BUGS
       To  compensate  for  ~/.cshrc  files  in  which aliases depend upon the prompt variable being set, which sets this variable to NULL. If the
       ~/.cshrc produces output or prompts for input when prompt is set, which can produce some strange results.

SunOS 5.11							    30 Mar 2005 							  which(1)