How to get a unix script to run every 15 seconds?

How to get a unix script to run every 15 seconds?

unix cron command sleep

unix

sleep 0 has special meaning?

ruby linux unix sleep

unix

Using Sleep() while using timers through setitimer

c++ unix timer sleep

unix

Sleep command in sh with variables

shell unix sleep

unix

Create a process and tell it to sleep?

c unix process fork sleep

unix

calling a command in for loop every 1 minute

java linux shell unix sleep

unix