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Script de sonde prêt :

#!/bin/bash                                                                                                                                        
#                                                                                                                                                  
# Nagios plugin to check file format in /etc/cron.d/                                                                                               
#                                                                                                                                                  
# Author : Christian Momon<cmomon@april.org>                                                                                                       

function usage() {
 echo "Usage : $0" 
}

#                                                                                                                                                  
result=null
if [ "$#" -ne 0 ]; then
    usage
    result=0
else
    bad="" 

    for filename in $(ls /etc/cron.d/); do
       #  echo "$filename"                                                                                                                         
        if [[ ! $filename =~ ^[a-zA-Z0-9_-]+$ ]] ; then
            bad="$bad $filename" 
        fi
    done

    #echo "bad=$bad"                                                                                                                               

    if [ -z "$bad" ]; then
        echo "OK" 
        result=0
    else
        echo "WARNING : bad file format detected in /etc/cron.d: $bad" 
        result=1
    fi
fi
exit $result