Great script, but needed it the other way around

Great script, but I needed a script to check if a file does not exist. On my Ubuntu server I want to check if the file /var/run/reboot-required does not exist and warn me if it does (to notify me the server needs a reboot).

To check this I just had to switch the output statements of the script, which I saved as check_file_notexists.

Hereby the altered code for check_file_notexists:

#! /bin/bash
#
# Author : Diego Martin Gardella [[email protected]]
# Modified by Erling Ouweneel to switch OK and CRITICAL
#
# Desc : Plugin to verify if a file does not exist
#
#

PROGNAME=`basename $0`
PROGPATH=`echo $0 | sed -e ‘s,[\/][^\/][^\/]*$,,’`

. $PROGPATH/utils.sh

if [ “$1” = “” ]
then
echo -e ” Use : $PROGNAME — Ex : $PROGNAME /etc/hosts n ”
exit $STATE_UNKNOWN
fi

if [ -f $1 ]
then
echo “CRITICAL – $1 : EXISTS :: `head -3 $1`” # shows the first three lines of the file
exit $STATE_CRITICAL
else
echo “OK : $1 Does NOT exists ”
exit $STATE_OK
fi