How to make script support file:/// notation?

When I copy any file and paste it in console or text editos it is passed as

file:///home/user/path/file

when I pass it to script it is not found

What is the easiest way to convert that to normal linux path or somehow make script support it?

for example

cat file:///home/user/path/file

says

No such file or directory

I don't know of any commands that convert between file urls and file paths, but you can convert with python, or any other language with bindings to gio. E.g.:

$ python -c 'import gio,sys; print(gio.File(sys.argv[1]).get_path())' file:///home/user/path/file%20with%20spaces
/home/user/path/file with spaces

You can also use urlencode (sudo apt-get gridsite-clients):

$ echo "$(urlencode -d "file:///folder/with%20spaces")"
file:///folder/with spaces
$ echo "$(urlencode -d "file:///folder/with%20spaces"|cut -c 8-)"
/folder/with spaces

If you don't need hexadecimal support, you can just use cut -c 8-. Alternatively, you could use urlencode with any other method of removing the file:// (sed, brace expansion, etc.)