users.sh

#!/bin/bash
function last10()
{

USERS=`last -n 30 | awk '{ print $1 }'`;
count=0;

for i in $USERS; do

        if [ $i != 'reboot' ] && [ $i != 'wtmp' ]; then

                  newUSERS="${i} ${newUSERS}"

        fi;

done

echo "=Last 10 Users================================";
echo "-username:GID -- Groups -- Last Login";

for i in $newUSERS; do

        USERGID=`id -u $i`;
        GROUPS=`groups $i`;
        LASTLOG=`lastlog | grep $i | cut -c44-80`
        echo "${i}:${USERGID} -- $GROUPS -- $LASTLOG";
        count=`expr $count + 1`;
        if [ $count = '10' ];then
                break;
        fi;
done;

}
function curlog() {

USERS=`who | awk '{ print $1 }'`;
count=0;

echo "=Current Users================================";
echo "-username:GID -- Groups -- Last Login";

for i in $USERS; do

        USERGID=`id -u $i`;
        GROUPS=`groups $i`;
        LASTLOG=`lastlog | grep $i | cut -c44-80`
        echo "${i}:${USERGID} -- $GROUPS -- $LASTLOG";
        count=`expr $count + 1`;
        if [ $count = '10' ];then
                break;
        fi;
done;

}

case $1 in

        l)
            last10;
        ;;
        *)
            curlog
        ;;
esac;