mysqldump all mysql containers

gistfile1.txt

!/bin/bash
ymlfiles=/my/docker/compose/containers
backupdir=/my/backups

for file in $(grep -lr "image: mysql" $ymlfiles/*/*.yml)
do
  	pw=$(grep MYSQL_ROOT_PASSWORD $file | cut -d"=" -f2)
        port=$(grep 3306 $file | sed -E 's/[-" ]+([0-9]+):([0-9]+)[-" ]+/\1/')
        name=$(echo $file | cut -d'/' -f5)
        mysqldump -hlocalhost --protocol=tcp -uroot -p$pw -P$port --all-databases > $backupdir/db-$name-$(date +%Y-%m-%d-%H-%M-%S).sql
done