The watch command
execute a program periodically, showing output fullscreen 1 example from the lessons of the IVski Linux Playground — try them in the terminal next to them.
Options in the examples
-h, --help- Display help text and exit.
-n, --interval seconds- Specify update interval. The command will not allow quicker than 0.1 second interval, in which the smaller values are converted.
Examples
watch -n 5 free -h