Run the command once per second in Bash- Run command every second in Bash?

problem ：

I want to write some image downloader and assign it on bash. I want to write some image downloaders and download them in bash Assign it on .What I have and what I need: What I have and what I need ：

I have: I have a ：

1. Command, which works fine (something like wget http://mywebcam.com/image.jpg -O /var/cam/Image.jpg ) command , Work well （ Be similar to wget http://mywebcam.com/image.jpg -O /var/cam/Image.jpg ）

2. Root rights Root permission

3. Fast Internet line between my server and my webcam Fast Internet connection between my server and my webcam

What I need: What I need ：

Download image from camera every second*(sleep 1?)* and rewrite it localy (my command do it well) Run this script at once and don't worry about restart (I think I need to create file with bash commands and run it once + set crontab work "on reboot" to this file, right?) Download images from the camera every second *（ sleep 1？）* And rewrite it locally （ My orders are well done ） immediately Run this script , Don't worry about restarting （ I think I need to use bash Command to create a file and run it once + set crontab work“on reboot” To this file , Right ？）

Maybe there's someone who knows what should I to do? Maybe someone knows what I should do ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/d1HE