#!/bin/bash

STATE_OK=0;STATE_WARNING=1;STATE_CRITICAL=2;STATE_UNKNOWN=3

usage()
{
cat << EOF
Usage: $0 remotehost filename
This script checks differecies of local and remote files
EOF
}

if [[ -z "$1" ]]; then usage; exit $STATE_UNKNOWN; else serv="$1"; fi
if [[ -z "$2" ]]; then usage; exit $STATE_UNKNOWN; else fname="$2"; fi

difs=""
ndifs=0

for f in $fname
do
 dif="$(ssh "$serv" "cat $f"|diff - $f)"
 if [[ $? -ne 0 ]]; then.
   ndifs=$(($ndifs + 1 ))
   difs="$difs$(echo $f):$dif"
 fi
done

if [[ $ndifs -eq 0 ]]
 then
  echo "OK: File $fname. Local and on host $serv has no differencies"; exit $STATE_OK
 else
  echo "CRITICAL: File $fname. Local and on host $serv has differencies"; echo "$difs"; exit $STATE_CRITICAL
fi