A script to help clean up docker images interactively

docker-rmi-interactive.sh

#!/bin/bash

agree() {
    local question="$1"
    
    while true; do
        read -p "$question " answer
        case $answer in
            [Yy]|[Yy][Ee][Ss]) return 0 ;;
            [Nn]|[Nn][Oo]|'') return 1 ;; # empty string is default
            *) echo "Please answer yes or no." ;;
        esac
    done
}

# Read image fields from file descriptor 3 using process substitution
# This lets us get feedback from the user via stdin within the while read loop
# (skip the header line with sed)
exec 3< <(docker images | sed '1d')

while read -u 3 repo tag image info; do
    agree "Remove image tagged $tag from repo $repo ($(echo $info))?" \
    && docker rmi $image
done