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+#!/bin/bash
+# clean_keyring.sh - clean up all the excess keys
+
+# origin: https://scruss.com/blog/2013/05/12/clean-up-your-gnupg-keyring/
+
+# my key should probably be the first secret key listed
+mykey=$(gpg --list-secret-keys | grep '^sec' | cut -c 13-20 | head -1)
+if
+    [ -z $mykey ]
+then
+    # exit if no key string
+    echo "Can't get user's key ID"
+    exit 1
+fi
+
+# all of the people who have signed my key
+mysigners=$(gpg --list-sigs $mykey | grep '^sig' | cut -c 14-21 | sort -u) 
+
+# keep all of the signers, plus my key (if I haven't self-signed)
+keepers=$(echo $mykey $mysigners | tr ' ' '\012' | sort -u)
+
+# the keepers list in egrep syntax: ^(key|key|…)
+keepers_egrep=$(echo $keepers | sed 's/^/^(/; s/$/)/; s/ /|/g;')
+
+# show all the keepers as a comment so this script's output is shell-able
+echo '# Keepers: ' $keepers
+
+# everyone who isn't on the keepers list is deleted
+deleters=$(gpg --list-keys | grep '^pub'|  cut -c 13-20 | egrep -v ${keepers_egrep})
+
+# echo the command if there are any to delete
+# command is interactive
+if
+    [ -z $deleters ]
+then
+    echo "# Nothing to delete!"
+else
+    echo 'gpg --delete-keys' $deleters
+fi