How to put a query in a single line to invoke from a script?

• In overpass turbo run your query.
• Click on export button and choose raw data from overpass api.
• Use the url of the page you landed on for wget.

You can try to use Overpass API

wiki page: [1]: https://wiki.openstreetmap.org/wiki/Overpass_API

site page: http://overpass-api.de/

and for a page that explain how to use it from a command line (or in your case from a script) see this page: http://overpass-api.de/command_line.html

Please note this two point:

1) the main server has an usage policy (see the wiki page about that)

2) the syntax used by Overpass api may be different from the one used by Overpass Turbo (I am not sure about this, there are two many languages used, I get confused)

Remove comments and newlines. You should get something like this:

[out:json][timeout:25];(node (poly: "45.5 11 45.6 11.6 45.2 11")["natural"="peak"];);out body;>;out skel qt;

urlencode that string. You can use this http://meyerweb.com/eric/tools/dencoder/ or any other tool for urlencode.

Get the encoded string and slap it in wget:

wget -O result.json "http://overpass.osm.rambler.ru/cgi/interpreter?data=%5Bout%3Ajson%5D%5Btimeout%3A25%5D%3B(node%20(poly%3A%20%2245.5%2011%2045.6%2011.6%2045.2%2011%22)%5B%22natural%22%3D%22peak%22%5D%3B)%3Bout%20body%3B%3E%3Bout%20skel%20qt%3B"