Запретить запуск нескольких копий скрипта about kwbackup HOT 3 OPEN

CMD_LINE="$0 $@"
ARGS_LINE="$@"

HASH=$(echo -n ${CMD_LINE} | sha1sum -t | /bin/cut -f1 -d" ")
FN_FLAG="/dev/shm/kwbackup_${HASH}.flag"

echo "/dev/shm/kwbackup_$(echo -n ${CMD_LINE} | sha1sum -t | /bin/cut -f1 -d" ").flag"

if [[ -f  ${FN_FLAG} ]]; then
    echo "$(date "+%d.%m.%Y %T") kwBackup already running with args '${ARGS_LINE}'"
    exit 1
else
    echo "$(date "+%d.%m.%Y %T") kwBackup started: '${ARGS_LINE}'" > ${FN_FLAG}
fi

echo "I am sleeping now for 10 secs..."

sleep 10

echo "I am awake"

rm -f ${FN_FLAG}