谢谢，还有一点怎么从那个命令行指定只有那一个文件的读和可执行性被改。你的那个命令看起来是把所有的文件的属性都改了，是吗？
put the file's name at the command line!
chmod operations files
operations can be the digits or the acronyms.
files can be a list of files whose permissions are to be changed.
operations can be the digits or the acronyms.
files can be a list of files whose permissions are to be changed.
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