Get separate files with the keys contained in /etc/apt/trusted.gpg keyring

split-apt-trusted-keyring.sh

gpg -k --no-default-keyring --keyring /etc/apt/trusted.gpg | \
  grep '^ ' | \
  tr -d ' ' | \
  grep -Eo '.{8}$' | \
  while read fingerprint; do
    ((++i));
    gpg \
      --export \
      --output /tmp/${i}-archive-keyring.gpg \
      --yes \
      --no-default-keyring \
      --keyring /etc/apt/trusted.gpg \
      ${fingerprint} ;
    gpg -k --no-default-keyring --keyring /tmp/${i}-archive-keyring.gpg ;
  done