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If I set 751 to a directory, the permission are: drwxr-x--x
the "x" what does it mean? If i set that permission means anyone could access to this directory but ONLY the owner and the GROUP could read the contents?
Let me know, thank you
765
"r" means: read permission. "w" means: write permission. "x" means: execute permission.
The capital X permission option tells chmod to grant execute access only if it makes sense -- if the item is a directory, or already has at least one execute access enabled (i.e. if it appears to be an executable file).
drwxr-xr-x. A folder which has read, write and execute permissions for the owner, but only read and execute permissions for the group and for other users.
drwxr-xr-x (755) -- Everyone can read the directory, but its contents can only be changed by the user.
The execute 'x' permission, when set for a directory, grants the ability to traverse its tree in order to access files or subdirectories, but not see the content of files inside the directory (unless read 'r' is set). (*)
So in your example, owner, group and others can do anything, group can cd into the directory and ls (read the list of the files within), others can just cd into the directory to access subdirectories, but that's quite an useless permission without "read".
(*) See http://en.wikipedia.org/wiki/Filesystem_permissions#Permissions
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