Check if a file matching file pattern in a path matching path pattern was modified in the last N minutes

check_mod_file_glob.sh

#!/bin/bash                                                                                                                                                                                                        
#
# Author: Lorenzo Gaggini - lorenzo.gaggini@dada.eu
# Check if a file matching file pattern in a path matching path
# pattern was modified in the last N minutes and it raise a CRITICAL
# if it's the case, it's OK otherwise.
#
# Usage: ./check_mod_file_glob.sh -p path_pattern -f file_pattern -c minutes

function usage()
{
    echo "Usage:"
    echo "./check_mod_file_glob.sh -p path_pattern -f file_pattern -c minutes"
    echo "-p (required): pattern matching pathname where to search for files"
    echo "-f (required): pattern matching filename to search for "
    echo "-c (required): number of minutes from the last modify of the file"
}

while getopts ":hp:f:c:" opt; do
    case ${opt} in
        h ) usage && exit 0;;
        p ) path_pattern=$OPTARG;;
        f ) file_pattern=$OPTARG;;
        c ) minutes=$OPTARG;;
        \?|*) usage && exit 1;;
    esac
done

if [ -z ${path_pattern+x} ] || [ -z ${file_pattern+x} ] || [ -z ${minutes+x} ]; then
    usage && exit 1
fi

matches=$(find ${path_pattern} -type f -mmin -"${minutes}" -name "${file_pattern}" -print)
if [ -z ${matches} ]; then
    echo "OK, no modified files in the last ${minutes} matching ${path_pattern} ${file_pattern} found"
    exit 0
else
    echo "KO, found files matching ${path_pattern} ${file_pattern} modified in the last ${minutes}: ${matches}"
    exit 2
fi