Quick NSString question

If I've got an NSString that contains a filename (including the path),
what's the best way of adding quotation marks to the beginnng and end?

In other words I'd like to convert:

/users/jim/file.ext

to

"/users/jim/file.ext"


I need to do this for passing it as an argument to a command-line util,
and it won't work as-is if there are spaces in the filename or path.

Many thanks.

Jim
-- 
"I need a dry run with the custard." - SWMBO.

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