How do I make a custom right click command for nautilus?

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http://askubuntu.com – I'm trying to make a Mark as executable command for the right click in nautilus for a faster work flow. I came up with this script: #! /bin/bash for file in $NAUTILUS_SCRIPT_SELECTED_FILE_PATHS; do gksudo "chmod +x $file" & done How do I get this to work though. I currently have a .sh file and have no idea where to put it. (HowTos)