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That question was asked 2 years ago.

From the current docs:

A universal variable is a variable whose value is shared across all instances of fish, now and in the future - even after a reboot. You can make a variable universal with set -U:

> set -U EDITOR vim

Now in another shell:

> echo $EDITOR vim

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My problem is not specific to EDITOR variable. E.g. sometimes I need to set PYTHONPATH per specific command. What irritates me is that the syntax to do that.

I am not asking for a way to make a variable universal, I am looking for a way to specify variable per command.

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