Fixed startup script

run

@@ -1,7 +1,14 @@
-#!/bin/sh
+#!/bin/bash
 
 PYTHON=`which python`
-DIR="$( cd -P "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+SOURCE="${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 $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
+done
+DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
 
 cd $DIR
-$PYTHON -m octoprint.server $@
+$PYTHON -m octoprint.server $@