Merge pull request #259 from iandstanley/patch-1

Script to switch between two Yubikeys with identical keys

switch-to-backup-yubikey

@@ -0,0 +1,23 @@
+#!/bin/sh
+#
+# To make a duplicate Yubikey for GPG keys
+# 1. Insert Yubikey1
+# 2. Create keys/subkeys
+# 3. Run keytocard to transfer keys to Yubikey1
+# 4. QUIT WITHOUT SAVING!!!!! 
+#
+# This will leave the keys on the Yubikey but NOT change the 
+# GPG keyring to point to the Yubikey1 with a stub
+# 
+# 5. Insert Yubikey2
+# 6. Run keytocard to transfer keys to Yubikey2
+# 7. QUIT and SAVE to make GPG point it's stubs to Yubikey2
+#
+# Running any decrypt, auth or sign will now ask you to insert Yubikey2
+# To switch to Yubikey1 at any time run this script to force GPG 
+# to repoint the key stubs to the inserted Yubikey
+
+read -p "Insert the Yubikey you want to use ....  "   ignore
+echo "Switching GPG to backup Yubikey ..."
+
+gpg-connect-agent "scd serialno" "learn --force" /bye