Run command every second in Bash?

Question

I want to write some image downloader and assign it on bash. What I have and what I need:

I have:

1. Command, which works fine (something like wget

Answer 1

If you want to run a command at one second intervals (one second between the end of one command and the beginning of the next, which is not the same as running every second), just do:

while sleep 1; do cmd; done

If you want that to start on reboot, the method will depend on your system.