Проверить наличие/изменение файлов, имена которых указаны в заданном файле

#!/bin/bash
case $1 in
--help) echo "USAGE: ./script.name file_with_files_list"
        exit 0 ;;
    ?*) if [ ! -f "$1" ]
        then
            echo "Wrong path or file name"
            exit 1
        fi ;;
     *) echo "No arguments. Start script with --help option to see usage"
        exit 1 ;;
esac
echo "New files:"
comm -23 <(ls) <(sort "$1")
echo
echo "Deleted files:"
comm -13 <(ls) <(sort "$1")
echo
echo "Renewed files:"
find $(<"$1") -prune -newer "$1" 2>/dev/null

USAGE: ./script.name file_with_files_list

cat <<\EOF >myscript1.sh
#!/bin/bash
case $1 in
--help) echo "USAGE: ./script.name file_with_files_list"
        exit 0 ;;
    ?*) if [ ! -f "$1" ]
        then
            echo "Wrong path or file name"
            exit 1
        fi ;;
     *) echo "No arguments. Start script with --help option to see usage"
        exit 1 ;;
esac
echo "New files:"
comm -23 <(ls) <(sort "$1")
echo
echo "Deleted files:"
comm -13 <(ls) <(sort "$1")
echo
echo "Renewed files:"
find $(<"$1") -prune -newer "$1" 2>/dev/null
EOF
chmod +x myscript1.sh

"No arguments. Start script with --help option to see usage"