How cron Scheduled tasks are executed every 30 seconds

<cron job, how do I make a script run in half a minute? >

Cron is not going to make it. But can be implemented with the help of the sleep command.

Workaround:

Two scripts

A normal, an increase in SLEEP30

Crontab setting starts at the same time

Sleep in some shells (such as bash in Linux) to support sleeping (minutes, hours)

Sleep can be used to delay the current action for a period of time

"Sleep parameter Description:"

--HELP: Display auxiliary messages

--version: Display version number

Number: Length of time, followed by S, M, H or D

Where S is the second, M is minutes, H is the hour, D is the number of days

Delay 1 minutes after displaying the current time, and then display the time again:

Date;sleep 1m;date

Sleep 1 sleeps 1 seconds

sleep 1s 1 seconds

Sleep 1m 1 min.

Sleeping 1h sleep 1 hours

Let one of the scripts sleep for 30 seconds, and the other to run correctly

(For example):

A.sh is your script.

Write a b.sh script again

The contents are as follows:

!#/bin/bash

Sleep 30

a.sh

Then add both scripts to the cron and set the same starting condition (minutes are *)

* * * * * */path/a.sh; /Path/b.sh

If you perform every 10 seconds, add the following in b.sh: