How to make bash execute a command after a certain amount of time?

Question

linux

I sketched out such a script, FFmpeg takes screenshots of TV channels, but how to make it do it every time after 3 minutes and delete the old screenshot?

#!/bin/bash 
ffmpeg -i http://127.0.0.1:1400 -r 0.1 -vframes 1 -s 640x360 -y /var/www/my/2x2.png&
ffmpeg -i http://127.0.0.1:1401 -r 0.1 -vframes 1 -s 640x360 -y /var/www/my/tnt4.png

Answer 1

add it to the cron
crontab -e
and add it to the beginning of the script

rm -f /var/www/my/2x2.png  /var/www/my/tnt4.png >/dev/null 2>&1

Answer 2

First, add to the script the deletion of files before creation, in order to fulfill the last condition.
Secondly:
1. in cron schedule for every three minutes
2. at the end of the script "sleep 180" And all this in an endless loop. Well, run - ka your heart desires.

Answer 3

If At a certain time, then man at or through crontab.
If AFTER a certain time, then sleep for the required number of seconds.