Shulou(Shulou.com)06/03 Report--

We know the importance of file permissions to the security of a system, and we also know the relevance of file permissions to users and groups, so how to modify the properties and permissions of a file?

Here we introduce several instructions that are commonly used for permissions for groups, owners, and various identities. As follows:

Chgrp: change the group to which the file belongs

Chown: change the file owner

Chmod: change the permissions of files, SUID, SGID, SBIT, and so on.

1. Change the group chgrp

[root@www] # chgrp [- R] dirname/filename...

Options and parameters:

-R: continuous recursive changes, that is, all files and directories in the subdirectory are updated to this group. It is often used to change all files in a directory.

Example:

[root@www ~] # chgrp users install.log [root@www ~] # ls-l-rw-r--r-- 1 root users 68495 Jun 25 08:53 install.log [root@www ~] # chgrp testing install.log chgrp: invalid group name `testing'

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