项目地址:https://missing.csail.mit.edu/

missing-semester(1)---Course overview + the shell
missing-semester(1)---Course overview + the shell
missing-semester(1)---Course overview + the shell
2.missing-semester(1)---Course overview + the shell
3.touch用于修改文件或目录的时间属性
missing-semester(1)---Course overview + the shell

4.missing-semester(1)---Course overview + the shell
5.
missing-semester(1)---Course overview + the shell
6.
missing-semester(1)---Course overview + the shell
missing-semester(1)---Course overview + the shell
可以看到semester文件只具有读写权限,没有运行权限,所以提示Permission denied

missing-semester(1)---Course overview + the shell
8.chmod可以改变文件或文件夹的权限
missing-semester(1)---Course overview + the shell
9.
missing-semester(1)---Course overview + the shell
10.
missing-semester(1)---Course overview + the shell
missing-semester(1)---Course overview + the shell

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