Instead of directly modifying value of PATH in config file you should add a new 
fish_user_paths universal variable which contains list of all the paths which 
you want to add to PATH. For e.g.

set -U fish_user_paths ~/foo/ ~/bar/

Now Fish will automatially add above listed directories to PATH.

On Sunday 18 Aug 2013 12:25:12 AM Michael Stillwell wrote:
> What's the recommended way to add a directory to $PATH?  It seems like
> a simple task, but I'm having trouble preventing the directory from
> being added multiple times every time I spawn a subshell, and making
> the new path available to child processes...
> 
> I'd also like the same code to work on OS X and Linux.  fish is my
> login shell on both.
> 
> 
> 
> 
> Michael
> 
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-- 
Regards,
Siteshwar Vashisht

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