Similarly, the || control operator separates two commands and runs the second command only if the first command returns a non-zero exit status.

类似地，|| 控制操作符分隔两个命令，并且仅当第一个命令返回非零退出状态时才运行第二个命令。

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This routine takes in two arguments, the second being the absolute value of time by which, if the lock could not be acquired, the routine returns with a non-zero status.

这个例程有两个参数，第二个参数是绝对时间值。如果在到达这个时间时还无法获得锁，例程会返回且状态码非零。

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Run a command only if another command returns a non-zero exit status.

仅当另一个命令返回非零退出状态时才运行某个命令。

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