Run the command several times per minute

ms.sh

#!/bin/bash

# Script can start few command instances in one minute
# with automatic sleep and count per second
# Created for run multiple commands each mimute with cron on linux OS
# Author: Dmitry Vapelnik <dvapelnik@gmail.com>
# Created: 2015-06-01 23:26:43

function help {
    HELP="You must use two arguments: first - how many time to execute command in next minute; second - commant to execute"
    echo -e $HELP
}

# Show help message
if [[ "$1" = "--help" || "$1" = "-h" ]]; then help; exit 0; fi

# Check count of arguments
if [[ ! "$#" = "2" ]]; then
    echo You must specify count of executions per minute and command
    exit 1
fi

let "c = 60 % $1"

# Calculate sleep for each command
if [[ "$c" = "0" ]]; then
    COUNT=$1
    let "SLEEP = 60 / $1"
else
    echo "60 % $1: 60 is not divisible by the value of the first argument"
    exit 1
fi

for ((n=0;n<$COUNT;n++))
do
    bash -c "$2" &
    sleep $SLEEP
done

exit 0