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並前往https://riptutorial.com/bash/example/16894/the-exit-code-of-a-function-is-the-exit-code-of-its-last-command

Bash Tutorial => The exit code of a function is the exit code of...

The output and error output of ping are both redirected to /dev/null , so the function will never output anything. But the ping command will have exit code ...

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