Bash settings w/ multiple C920 logitech cameras

c920.sh

#!/bin/bash

cameras=(0 1 2)

function apply_cams() {
    # Apply `v4l2-ctl $@` to all cams
    #   Example usage: apply_cams -C focus_auto
    for cam in "${cameras[@]}"; do
        echo "/dev/video$cam"
        v4l2-ctl -d $cam $@
    done
}

alias list_cam_ctrls='v4l2-ctl -L'

: """
Common v4l2-ctl commands I care about:
-C, --get-ctrl=<ctrl>[,<ctrl>...]
    get the value of the controls
-c, --set-ctrl=<ctrl>=<val>[,<ctrl>=<val>...]
    set the value of the controls
-d, --device=<dev>
    use device <dev>
-l, --list-ctrls
    display all controls and their values
-L, --list-ctrls-menus
    display all controls and their menus
"""