diff --git a/aerofs/aerofs-puburl b/aerofs/aerofs-puburl
new file mode 100755
index 0000000..4216dc3
--- /dev/null
+++ b/aerofs/aerofs-puburl
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+if [ ! -e "$HOME/.aerofs/pub.root" ]
+then echo file "$HOME/.aerofs/pub.root" not found.
+     echo it must contain the string of your http server with pub files.
+     echo ex.  http://server.com:7777/
+     exit 1
+fi
+
+MyRoot=$( sqlite3 $HOME/.aerofs/conf "SELECT v FROM c WHERE k = 'root';" )/Public/
+
+
+MyServerRoot=$( cat "$HOME/.aerofs/pub.root" | tr -d "[:cntrl:]" ) 
+
+if [ -z "$1" ]
+then echo provide filename
+     exit 0
+fi
+
+absPath=$( readlink -f "$1" )
+if [ ! -e "$absPath" ]
+then echo file $absPath not found.
+     exit 1
+fi
+
+if [[ ! "$absPath" == "$MyRoot"* ]]
+then echo $absPath not in $MyRoot
+     exit 1
+fi
+
+echo $MyServerRoot${absPath##$MyRoot}