Check for untaken or 404 GitHub Usernames

GithubNameChecker.sh

#!/usr/bin/env bash

# Exit on error
set -e


# On MacOS, make sure shuf command is available



# All possible combinations of 4 letters,
# each on one line for streaming and in random order
combinations="$(echo {a..z}{a..z}{a..z}{a..z} | tr " " "\n" | shuf)"

echo "possibilities: $(echo "$combinations" | wc -l)"


# Filter to only names that 404 on github.com,
# 10 in parallel (might still take a while),
# and write them to a file
echo "$combinations" | xargs -P10 -I{} sh -c "curl -sfI https://github.com/{} > /dev/null || echo {}" > github.txt

echo "available on Github: $(wc -l github.txt)"