Run bash command every X s

To run bash command in time interval you could simple run this command in while command.
You could also stop this command after X num of seconds.

#!/bin/sh

STATE=true
RUNTIME=0
STOPAFTER=1200
  
while STATE
do  
  # your command here  
  sleep 300
  RUNTIME+=300
  if(STOPAFTER >= RUNTIME)
     STATE=false
  fi
done

Alternatively you can use cron jobs. You can use crontabs command to view and edit corn jobs.

# crontab -e
SHELL=/bin/bash
MAILTO=root@example.com
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin

# For details see man 4 crontabs

# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name  command to be executed

# backup using the rsbu program to the internal 4TB HDD and then 4TB external
01 01 * * * /usr/local/bin/rsbu -vbd1 ; /usr/local/bin/rsbu -vbd2

# Set the hardware clock to keep it in sync with the more accurate system clock
03 05 * * * /sbin/hwclock --systohc

# Perform monthly updates on the first of the month
# 25 04 1 * * /usr/bin/dnf -y update

https://opensource.com/article/17/11/how-use-cron-linux
https://askubuntu.com/questions/852070/automatically-run-a-command-every-5-minutes