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並前往https://www.quora.com/The-built-in-return-command-in-bash-is-for-the-shell-functions-but-why-isnt-the-exit-command-sufficient-for-shell-functions

The built-in 'return' command in bash is for the shell functions ...

the above exit would not terminate the whole script and 99 is printed. the return command returns status from a shell function: check-things() {.

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