A simple way to upgrade all packages in an Open WRT distribution

opkg-upgrade-all

#!/usr/bin/env sh                   
for p in $(opkg list-upgradable); do
  if [ "$p" != "-" ]; then                                    
    if [ "$(echo ${p:0:1} | sed -e 's/[0-9]//')" != "" ]; then
      echo "upgrading $p"
      opkg upgrade $p
    fi
  fi
done

don't forget to chmod +x opkg-upgrade-all or use sh to run it