Get all the host's containers and show the log size of each one. Then truncate the log when the user presses any key.

truncate_all.sh

#!/bin/bash

container_ids=$(docker ps -aq)

for id in $container_ids; do

    log_size=$(docker inspect --format='{{.LogPath}}' $id | xargs du -sh | awk '{print $1}')
    name=$(docker inspect --format='{{.Name}}' $id | sed 's/\///')

    echo "Container ID: $id"
    echo "Container Name: $name"
    echo "Log Size: $log_size"
    echo

    read -p "Press enter to clear . . ."
    truncate -s 0 $(docker inspect --format='{{.LogPath}}' $id)
    read -p "Log was cleared! Press enter to continue . . ."
done