How to update all Snap packages

Question

I know that I can update a snap package using

sudo snap refresh <package>

But there is a way to update all snaps, like

sudo apt dist-upgrade

Answer 1

snap refresh 

will do this. It is part of snapd 2.0.8, which landed 2016-06-13 in xenial-updates.

Answer 2

Try this in /usr/bin/update-snaps:

#!/bin/bash
ROOT_UID="0"

#Check if run as root
if [ "$UID" -ne "$ROOT_UID" ] ; then
        echo "You must be root to do that!"
        exit 1
fi

snap list | awk -F" " '{if ($1 && NR>1) { system("snap refresh " $1 " 2>/dev/null") }}'