The single-character command is the action to perform on the specified lines.

单字符的 command 是要对指定行执行的操作。

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If the first character of a command is a hyphen (-), the remainder of the line is executed, but its exit status is ignored.

如果一个命令的第一个字符是连字符(-)，那么该行中剩余的命令都会执行，不过其退出状态会被忽略。

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