#!/bin/bash
# Shell script to display ps for specified user or for user who runs
# the script (when no argument is given).
# Version 4.2 - Enhanced to deselect scriptname, bash process from script and
# options in output.
# Version 4.3 - Filter user with option 'u'.
# Version 4.4 - Add option to show threads.
# Version 4.5 - Add option to show only background processes.
# -------------------------------------------------------------------------
# Author R.W.H. Vermare 2008 - 2022 - <rene(at)vermare(dot)net>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of the Doctor Linux collection
# -------------------------------------------------------------------------
BIN=${0##*/}
help_function(){
    echo "Usage: $BIN			: Displays all processes from current user."
    echo "       $BIN <process-name>	: Displays all given processes." 
    echo "       $BIN b <process-name>	: Displays all specified background processes."
    echo "       $BIN t <process-name>	: Displays all given processes and threads." 
    echo "       $BIN u <process-name>	: Displays all specified processes for"
    echo "                  		  current user."
}
[ "$1" != "" ];
if [ -z "$1" ]
then
user=`whoami`
  ps axu | grep $(whoami) | sed '/'$BIN'/d' | sed '/grep '$user'/d' | sed '/ps axu/d'
elif [ "$1" = "-help" ]; then
  help_function
elif [ "$1" = "u" ]; then
 [ "$2" != "" ];
 if [ -z "$2" ]
 then
  help_function
 else 
  ps -U $(whoami) -u $(whoami) u | grep $2 | sed '/'$BIN' u '$2'/d' | sed '/grep '$2'/d'
 fi
elif [ "$1" = "t" ]; then
 [ "$2" != "" ];
 if [ -z "$2" ]
 then
  help_function
 else 
  ps -eLf | grep $2 | sed '/'$BIN' t '$2'/d' | sed '/grep '$2'/d'
 fi
elif [ "$1" = "b" ]; then
 [ "$2" != "" ];
 if [ -z "$2" ]
 then
  help_function
 else 
  ps axu | grep $2 | sed '/'$BIN' b '$2'/d' | sed '/grep '$2'/d' | sed '/pts\//d'
 fi
else
  ps axu | grep $1 | sed '/'$BIN' '$1'/d' | sed '/grep '$1'/d'
exit 0
fi