add 'scriptdir' example to stash away that aweful pattern

bin/scriptdir

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# This file is more of an example.
+
+# This is the level of bullshit required to safely get the scriptdir in bash
+scriptdir() {
+  SOURCE="${BASH_SOURCE[0]}"
+  while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
+    DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+    SOURCE="$(readlink "$SOURCE")"
+    [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
+  done
+  echo "$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+}
+
+echo "\$0=$0"
+echo $(scriptdir)
+
+