Variable	Definition
P4CLIENT	Name of current client workspace
P4CONFIG	File name from which values for current environment variables are to be read from
P4DIFF	The name and location of the diff program used by p4 resolve and p4 diff
P4EDITOR	The editor invoked by those Perforce commands that use forms
P4JOURNAL	A directory that holds the database journal files
P4LOG	Name and path of the file to write Perforce errors to
P4MERGE	A third-party merge program to be used by p4 resolve's merge option
P4PAGER	The program used to page output from p4 resolve's diff option
P4PASSWD	Stores the user's password as set in the p4 user form
P4PORT	For the p4d server, the port number to listen on;for the p4 client, the name and port number of the p4d host to communicate with
PWD	The directory used to resolve relative filename arguments to p4 commands
P4ROOT	Directory in which p4d stores its files and subdirectories
P4USER	The users Perforce username
TMP	The directory to which Perforce writes its temporary files