NAME:
	update_logfile
 PURPOSE:
	Updates ~/LOGFIL.TXT file. Creates new file if it
	doesn't exist.
 CALLING SEQUENCE:
	update_logfile
 OUTPUTS:
	The file ~/LOGFIL.TXT is initialized
 CALLS:
	mkenv, sprint_setup
 CALLED BY:
	login, login_csh
 PROCEDURE:
	Uses mkenv to add entries to ~/LOGFIL.TXT
	The executable mkenv is located using the 'which' command,
	i.e. it must be in the PATH.
 MODIFICATION HISTORY:
	AUG-2002, Paul Hick (UCSD/CASS; pphick@ucsd.edu)