get names from uuid files in minecraft/world/playerdata/*

uuid2name.sh

#!/bin/bash
# get names from uuid files in minecraft/world/playerdata/*

show_usage() {
        echo "usage: $0 [file..]"
        echo
        echo "Where \`file' is one or more uuid.dat file located in minecraft/world/playerdata/"
        echo "Example: $0 minecraft/world/playerdata/*"
}

getname() {
        uuid=$(basename -s .dat $1)
        uuidtrim=$(echo $uuid | tr -d '-')
        name=$(curl -s https://api.mojang.com/user/profiles/$uuidtrim/names | jq -r '.[-1]["name"]')
        echo -e "$name\t$uuid"
}

# check if jq is installed
command -v jq >/dev/null 2>&1 || {
        echo >&2 "The program \`jq' is required but not installed."
        echo >&2 "See https://stedolan.github.io/jq/download/"
        echo >&2 "Aborting."
        exit 1
}

# show usage
if [[ $# == 0 ]]; then
        show_usage
        exit 1
elif [[ $1 == '-h' || $1 == '--help' || $1 == 'help' ]]; then
        show_usage
        exit 0
fi

# main()
for f in "$@"; do
        [[ "${f##*.}" == 'dat' ]] && getname $f
done