fish-shell/doc_src/cmds/not.rst

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.. _cmd-not:
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.
Example
-------
The following code reports an error and exits if no file named spoon can be found.
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::
if not test -f spoon
echo There is no spoon
exit 1
end