Linux – difference between chmod 777 and chmod 007

chmodlinuxpermissionsSecurity

What is the difference between chmod 777 and chmod 007? if 'others' means everyone, doesn't that strongly suggest the truth that chmod 777 = chmod 007?

Best Answer

It may suggest that, but it isn't the case.

The first digit is "owner" permissions, the second is "group" permissions - and the owner and group are viewable with ls -l, and the third is "others", which literally means those that aren't either the owner or in the group.

So 007 means that neither the owner or group members can read, write, or execute the file, while everyone else can do all three.

Related Solutions

Ubuntu – chmod 777 on local server not working

Using 777 on an server with an ftp is not safe, so unless it's a very isolated network I'd suggest using 700 and changing the user (chown) or 770 and changing the group (chgrp) to manage the permisions if you are developing with some other users.

So if the ftp user you are using is for example myftpuser

sudo chown -R myftpuser /path/to/file
sudo chmod -R 700 /path/to/file

Should work.

The wikipedia article on file system permissions may be relevant too

Whats the difference between chmod 777 and chmod 7777

In 7777, the first three bits are the setuid, setgid, and sticky flags. These should only be set under very special circumstances. You're correct that 777 is the more appropriate setting (if you want to make the file both world-writable and world-executable).

And unless the file is an executable program or script, or a directory, you usually shouldn't set the x bits. There's not much harm in doing so, though.

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Ubuntu – chmod 777 on local server not working

Whats the difference between chmod 777 and chmod 7777

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