How do I periodically run a command with very short intervall and get the return?

Question

i need to call a specific command in an interval of about 5 sec. How would I setup a daemon/process running in the background or something similiar to do that? I looked at cronjobs, but the minimum intervall seems to be 1 minute. Any advice is apperciated ;)

Fedora is the system.

EDIT the command would be a bashscript, so "watch" wouldn´t do it I think.

Answer 1

(
  while true
  do
    your-command-here
    sleep 5
  done
) &
disown

Answer 2

Why do you think 'watch' will not work?

$ cat periodic.sh
#!/bin/bash
echo $(date)
$ chmod +x periodic.sh

---

$ watch -n 5 ./periodic.sh

Answer 3

Maybe with nohup? It's designed to let a job run after the shell is closed.

You can also use screens.