lwho

#!/bin/sh
#
# Copyright (c) 2001-2015 Matthew Pearson <matthewpearson@gmail.com>.
#
# These scripts are free. There is no warranty; your mileage may vary.
# Visit http://creativecommons.org/licenses/by-nc-sa/4.0/ for more details.
#
# $Id$
# print a list of other users on the system
#

PATH=/bin:/usr/bin

USAGE="usage: `basename $0` [-cqsh]"
VSAGE="\t-c don't check console logins\n\
       \t-q print nothing if no-one else is using host\n\
       \t-s print abbreviated output (less info on root logins)\n\
       \t-h print this message\n"

# on some systems there is no nawk
awk 1 /dev/null >/dev/null 2>&1
[ $? -eq 0 ] && alias nawk=awk

while getopts cqsh arg
do
	case $arg in
	    c)	noconsole=y ;;
	    q)	quiet=y ;;
	    s)	short=y ;;
	    h)	echo $USAGE
		printf "$VSAGE"
		exit 0 ;;
	    *)	echo $USAGE
		exit 1 ;;
	esac
done

# get a list of users other than yourself
#wholines=`who --lookup 2>/dev/null`
#[ $? -eq 0 ] || wholines=`who`
wholines=`who`
wholist=`echo "$wholines" | sort | fgrep -v __G_USER__`

# optionally strike out console users
[ "$noconsole" ] && wholist=`echo "$wholist" | grep -v console`

users=`echo "$wholist" | cut -d" " -f1 | uniq`

if [ "$short" ]
then
	usercnt=`echo "$users" | wc -l`

	# simple list of users, including root
	if [ "$usercnt" -ge 2 ]
	then
		echo $usercnt " users:" $users
	elif [ "$users" ]
	then
		echo "1 user:" $users
	fi
else
	# strike out root users
	users=`echo "$users" | grep -v root`
	usercnt=`echo "$users" | wc -l`

	# all users but root on one line
	if [ "$usercnt" -ge 2 ]
	then
		echo $usercnt " users:" $users
	elif [ "$users" ]
	then
		echo "1 user:" $users
	fi

	# and root users along with the connecting host
	roots=`echo "$wholist" | nawk '/root/ {
		sub(":.*","",$6)
		if ($6)
			print $6	# connecting from
		else
			print $2	# or connected to
	    }' | sed -e 's/)//' -e 's/(//' | uniq`
	[ "$roots" ] && echo "root via:" $roots
fi

[ "${users}${roots}${quiet}" ] || \
    echo "no one else on `uname -n`"

#EOF __TAGGED__