Add ppwd script to skel directory

skel/usr/bin/ppwd

@@ -0,0 +1,19 @@
+#!/bin/sh
+set -e -o pipefail
+
+dir="$(echo -n "${1:-$PWD}" | sed "s|$HOME|~|")"
+
+if [ "$dir" = '~' -o "$dir" = '/' ]; then
+    echo "$dir"
+    exit 0
+fi
+
+parts="$(echo "$dir" | tr '/' '\n' | sed '$d')"
+last="$(echo "$dir" | tr '/' '\n' | tail -n 1)"
+
+for d in "$parts"; do
+    out="$out$(echo "$d" | sed -E '/^\./s/^(.{2}).*/\1/;/^[^\.]/s/^(.{1}).*/\1/')\n"
+done
+
+echo -en "$out" | tr '\n' '/'
+echo "$last"