[MacPorts] #53473: port diagnose and fish shell

[MacPorts]

#53473: port diagnose and fish shell
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 Reporter:  bestlem  |      Owner:
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  base     |    Version:
 Keywords:           |       Port:
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 I use a non POSIX shell - fish

 When I run port diagnose it gives

 Warning: your $PATH environment variable does not currently include,
 /opt/local/bin, which is where port is located.  Would you like to add
 /opt/local/bin to your $PATH variable now? [Y/N]

 Which has two issues

 /opt/local/bin is on my path and so there is not an error
 Second issue is that it cannot add to my path so the question is
 meaningless

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Ticket URL: <https://trac.macports.org/ticket/53473>
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