[ubuntu-uk] Vim keybinding for filter

[DarkOtter]

Sorry to ask what is probably a silly question (I bet i've just missed one vital
detail in this). Anyways, I am trying to set a keybinding for a filter in vim. I
can use the filter normally (i.e by typing :%!~/Scripts/Signature <enter>) but
when I try to map it to a key it does not worked. The command I tried using to
map it was as follows:

:map ^s :%!~/Scripts/Signature

this does not give me an error message, but then when I press ^s nothing
happens. I couldn't quite remember whether ^s was alt+s or ctrl+s in vim, so I
tried both and neither seemed to do anything.

Thanks in advance for any help.
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