Sharing Write Permission
For more than one user to be able to write to the same directory it will be necessary to grant write permission to a group they share in common. The following example grants shared write permission to /var/www to the group “webmasters”.
sudo chgrp -R webmasters /var/www
sudo find /var/www -type d -exec chmod g=rwxs “{}” \;
sudo find /var/www -type f -exec chmod g=rws “{}” \;
EXAMPLES
chgrp staff /u
Change the group of /u to “staff”.
chgrp -hR staff /u
Change the group of /u and subfiles to “staff”.
SSL/TLS Manage Certificate Sharing
If you are the server administrator, you can choose to allow your customers to share your SSL certificate.
1. Click Change Certificate Sharing Permissions to begin.
2. On the Manage SSL Certificate Sharing screen, click Enable Sharing.
Click Disable Sharing if you want to disallow users from sharing your certificate.
3. Under the Certificate Linking heading, select a domain to see an accurate link example.
Linux assigns the file permissions of the new file using your default UID and GID. To allow others access to the file, you need to either change the security permissions for the everyone security group or assign the file a different default group that contains other users.
This can be a pain in a large environment if you want to create and share documents among several people. Fortunately, there’s a simple solution for how to solve this problem.
There are three additional bits of information that Linux stores for each file and directory.
The set user id (SUID): When a file is executed by a user, the program runs under the permissions of the file owner.
The set group id (SGID): For a file, the program runs under the permissions of the file group. For a directory, new files created in the directory use the directory group as the default group.
The sticky bit: The file remains (sticks) in memory after the process ends.
The SGID bit is important for sharing files. By enabling the SGID bit, you can force all new files created in a shared directory to be owned by the directory’s group and now the individual user’s group.
The SGID is set using the chmod command. It’s added to the beginning of the standard three digit octal value (making a four-digit octal value), or you can use the symbol s in symbolic mode.
