Create GPG Key for GitHub Commit Signing

gpg.sh

#!/bin/sh
set -eu

#
# Commands for generating a new GPG key for GitHub commit signing.
#
# https://help.github.com/articles/generating-a-new-gpg-key/
#

gpg --full-gen-key
# 1. 1
# 2. 4096
# 3. 1y
# 4. Richard Fussenegger
# 5. [email protected]
# 6. GitHub
# 7. ****************************************
id=$(gpg --list-keys --keyid-format LONG | grep -Eoe'4096R/([A-Z0-9]+)' -m1 --color=never | cut -d/ -f2)
gpg --armor --export $id >public.key
gpg --armor --export-secret-key $id >private.key
printf 'Add %s as signingkey to your global .gitconfig file\n' $id

--full-gen-key was needed on my system to be asked about the key size