Edit a line to execute a file on a schedule?

Question

Raspberry Pi

This line:
*/1 8-21 * * * sudo fswebcam -c /home/pi/.cam.conf
in the file:

crontab -e

Launches a snapshot from the camera to send to the cloud drive.
Every minute. Those. The unit at the beginning is one minute. The question is how to make it run every 10 seconds? Fractions do not work visited!

Answer 1

As you have already written above, the minimum period of time is crona minute. There are several options

• write a script that will run a command and sleep for 10 seconds in a loop 5 times and run this script every minute from cron
  
• use watch command
  
• Use the timer in SystemD, for this you will need to create 2 files, one for the unit itself and the second for the timer
  

Answer 2

Unfortunately, crontab does not allow you to work with time intervals of less than one minute.

Answer 3

If the system has systemd, then you can use systemd.timer There are seconds .