#!/bin/sh 
#
# This is vipw, the password file editor.
#
# This version of vipw was written because the vipw on HP-SUX is broken.
# No matter what you do to the file, it rejects your changes.  Hence
# this script.  It copies /etc/passwd/ to /etc/ptmp, lets you edit it,
# and then replaces /etc/passwd with the /etc/ptmp.
# 
# If an error occurs the /etc/ptmp file may remain around, in which case
# nobody else can make changes to the password file.  Keep that in mind.
# Eric Myers <myers@umich.edu>		- 18 July 1996 (or so)
# Department of Physics, University of Michigan, Ann Arbor
# @(#) $Revision: 1.3 $ - $Date: 1996/09/03 20:57:48 $ - $Author: myers $
#######################################################################
EDITOR=${EDITOR-"/usr/ucb/vi"}
PTMP=/etc/ptmp		# temporary editing file is also a lock file

# vipw first makes sure another vipw is not running by looking
# for the file ${PTMP}.  If it already exists, vipw aborts.

if [ -f ${PTMP} ]; then
  echo "vipw: password file locked (${PTMP} exists)"
  exit 1
fi

# Get a copy of the password file 

/bin/cp /etc/passwd ${PTMP}

# Edit this password file

if $EDITOR $PTMP
then if [ -s $PTMP ]; then
       if /bin/cp -f ${PTMP} /etc/passwd
       then 
          /bin/rm -f ${PTMP}
	  exit 0
       else 
          echo "vipw: cannot copy $PTMP to /etc/passwd."
          exit 1
       fi
     else echo "vipw: $PTMP was empty."
          /bin/rm -f ${PTMP}
	  exit 2
     fi	
else echo "vipw: $EDITOR $PTMP  failed."
     exit 3
fi

# Always remove /etc/ptmp file, except for certain errors,
# as it's a lock file.

/bin/rm -f ${PTMP}

exit 0