Add myip function

Previously a myip script in grml-scripts.

grml/grml-scripts#27

Author: zeha

etc/zsh/zshrc

@@ -3443,6 +3443,11 @@ function _simple_extract () {
 compdef _simple_extract simple-extract
 [[ -n "$GRML_NO_SMALL_ALIASES" ]] || alias se=simple-extract
 
+#f5# Show "public" IPv4 address of current system on stdout. Requires network access and curl(1).
+function myip () {
+    curl http://v4.showip.spamt.net/ -H 'User-Agent: grml-etc-core-zshrc'
+}
+
 #f5# Change the xterm title from within GNU-screen
 function xtrename () {
     emulate -L zsh