> How about using a shell script:
> 
> #!/bin/sh
> vimx=`which vim`
> PATH=""
> echo $PATH
> exec $vimx
> 
> Then in vim:
> :echo $PATH
> returns empty.
> 
> That way you do not disturb the system PATH.

? I am talking about unsetting environment variables which are set in vim. How 
is this script related?

Also for your job there is much easier way: `PATH= vim …`. And you forgot about 
quoting of `which vim`, vim arguments and so on.

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