The second line appends a shell's history to your history file when the shell exits.
第二行在shell退出时将shell的历史记录附加到您的记录文件。
If you press Ctrl-C in the shell or the script exits, the cleanup process is performed, which unloads the module and causes all associated utilities to exit.
如果在shell中按组合键ctrl - C或脚本退出，将执行清除进程，这将导致卸载模块并退出所有相关的实用程序。
When a shell script process exits or returns to the parent process, the exit code should be 0.
当shell脚本进程退出或返回到父进程时，退出码应该是0。
When a shell script process exits or returns to the parent process, the exit code should be 0.
当shell脚本进程退出或返回到父进程时，退出码应该是0。
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