Linux目录权限相关问题
最近老是忘记这个东西，现在总结一下不然下次又忘掉了。
R：就是读权限，用ls命令的的时候必须有这个权限，但是单纯的R权限又没有多大作用，一般是要带X（执行）权限。
W：写权限，比较好理解，删除，修改，创建文件都需要写权限，需要W权限的相关命令是mv，rm等等，但是依旧有一个问题，如果没有X权限还是没多大用处。
X：执行权限，如果在文件上的话比较好理解就是“可执行”的意思，但是用在目录这里则是表示“可以进入”的意思，就是你要进入这个目录时候就要求这个权限，比如cd，ls命令都需要相应目录的X权限。
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