#!/bin/sh
#
# pschanges - list processes and compare with the previous time we ran
#
# $Id#

NEW=`mktemp pschanges-XXXXX`
OLD=$HOME/.pschanges

Die()
{
  echo "$@" 1>&2
  exit 1
}

Ps()
{
  ps -e -o user,pid,ppid,cmd |
  awk '$2 != "'$$'" && $3 != "'$$'" {print}'  # exclude myself
}

Ps > $NEW || Die cannot save ps result to $NEW
diff -NdU0 $NEW $OLD |
  awk ' /^[-+][^-+x]/ && $2 != "'$$'" && $3 != "'$$'" {print}'
mv $NEW $OLD || Die cannot save ps result to $OLD