not - negate the exit status of a job
Synopsis
not COMMAND [OPTIONS ...]
Description
not
negates the exit status of another command. If the exit status is zero, not
returns 1. Otherwise, not
returns 0.
The -h or --help option displays help about using this command.
Example
The following code reports an error and exits if no file named spoon can be found.
if not test -f spoon echo There is no spoon exit 1 end
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https://fishshell.com/docs/3.5/cmds/not.html