diff

    diff -- Display diff of client file with depot file

    p4 diff [ -d -f -sa -sd -se -sr -t ] [ file[rev] ... ]

	Run diff (on the client) of a client file against the corresponding
	revision in the depot. The file is only compared if the file is
	opened for edit or the revision provided with the file argument is
	not the same as the revision had by the client.  See p4 help
	revisions for help specifying revisions.

	If no file argument is given, diff all open files.
	This can be used to view pending changelists.

	The -d passes a flag to the built-in diff routine to modify
	the output: -dn (RCS), -dc (context), -ds (summary), -du (unified).

	The -f flag forces a diff for every file, regardless of whether
	they are opened or if the client has the named revision.
	This can be used to verify the client contents.

	The -s flag reduces the output of diff to the names of files
	satisfying the following criteria:

		-sa     Opened files that are different than the revision
			in the depot, or missing.

		-sd     Unopened files that are missing on the client.

		-se     Unopened files that are different than the revision
			in the depot.

		-sr     Opened files that are the same as the revision in the
			depot.

	The -t flag forces p4 diff to diff even files with non-text
	(binary) types.

	If the environment variable $P4DIFF is set then the named program is
	used rather than the implementation of diff included in the client.
	The -dcommand can be used to pass arguments to the 
	external program.  The -s flag is only implemented internally.