I use "_eof_" (EOF is short for "End Of File") because it is traditional, but you can use anything, as long as it does not conflict with a bash reserved word.

我使用“ _ E OF _ ” (EOF表示文件的末尾)，是因为，这是一个传统的表示形式，但是，你可以使用任何字符穿，只要你所用的字符串不跟bash的保留字相冲突就可以了。

youdao

When all the data have been written, set the eof (end-of-file) argument.

当所有数据全部写入之后，就需要设置eof(文件结束参数)。

youdao

It returns NULL, defined in stdio.h, for either error or EOF [end-of-file]; after the loop, we check for which one occurred.

对于错误或EOF[文件结束]，它都返回NULL，这是在stdio . h中定义的；循环结束后，我们会检查究竟是哪种情况。

youdao