not - 反轉工作的退出狀態

概要

not COMMAND [OPTIONS ...]
! COMMAND [OPTIONS ...]

描述

not negates the exit status of another command. If the exit status is zero, not returns 1. Otherwise, not returns 0.

有些其他外殼僅支援 ! 別名。

The -h or --help option displays help about using this command.

範例

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