#!/bin/bash
# $# == 4, sonst UNKNOWN, Hilfe und exit 3
if [ $# -ne 4 ] ; then
        echo "Usage:"
        echo "./check_users_new -w <users> -c <users>"
        exit 3
fi

# -w <users> -c <users> oder -c <users> -w <users>
if [ $1 = -w ] && [ $3 = -c ] ; then
        W=$2
        C=$4
elif [ $1 = -c ] && [ $3 = -w ] ; then
        W=$4
        C=$2
else
        echo "invalid arguments ... (./check_users_new $1 $2 $3 $4)"
        echo "Usage:"
        echo "./check_users_new -w <users> -c <users>"
        exit 3
fi

# $W < $C, sonst UNKNOWN und exit 3
if [ $W -ge $C ] ; then
        echo "invalid values ... (-w $W >= -c $C)"
        echo "-w must be lower than -c"
        exit 3
fi

# Nutzerdaten holen
USERS=`users | wc -w`
INFO=`who | cut -d' ' -f1,12 | tr ' ' @ | tr '\n' ',' | tr -d '()' | rev | cut -c 2- | rev`

# $USERS == 0
if [ $USERS -eq 0 ] ; then
        echo "OK - $USERS - No users|users=$USERS;$W;$C;0;"
        exit 0
# $USERS < $W
elif [ $USERS -lt $W ] ; then
        echo "OK - $USERS - $INFO|users=$USERS;$W;$C;0;"
        exit 0
# $USERS < $C
elif [ $USERS -lt $C ] ; then
        echo "WARNING - $USERS - $INFO|users=$USERS;$W;$C;0;"
        exit 1
# $USERS >= $C
else
        echo "CRITICAL - $USERS - $INFO|users=$USERS;$W;$C;0;"
        exit 2                                                                                                                                                                     
fi