fish-shell/sphinx_doc_src/cmds/not.rst

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not - negate the exit status of a job
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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.
Example
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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