Statement 6 chains two commands with the or operator: the second command (echo) executes only if the first command fails.
语句6用or操作符连接两个命令：第二个命令(echo)只在第一个命令失败的情况下执行。
Statement 6 chains two commands with the or operator: the second command (echo) executes only if the first command fails.
语句6用or操作符连接两个命令：第二个命令(echo)只在第一个命令失败的情况下执行。
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