Android ADB bash Script

I am looking to create a simple script that allows me to uninstall and reinstall an application on many devices connected to a hub. This should be a quick easy task for anyone who understands the language. Some of the devices have the application installed as a system app and others are not. This requires a check and uninstall based on its location. Once uninstalled the new version which is a different signing needs to be installed. Below I included the code I started working on and got stuck. while read sn device; do adb -s "$sn" root adb -s "$sn" shell file="/system/app/ourcompany-gallery" if [ -f "$file" ] then rm -rf ourcompany-gallery else exit adb -s "$sn" uninstall [login to view URL] fi adb -s "$sn" install E:\[login to view URL] adb -s "$sn" shell reboot done < <(adb devices | sed '1d')