GID, current, primary, supplementary, effective and real group IDs?
The following links discuss these concepts in different contexts. I have read their definitions, but I still can’t tell how they are related, or if some of them are just the same.
privileges
Allowing a user to let listen to a port below 1024
I need to allow a user (different from root) to run a server listening on port 80.
What is the safest way for programmatically writing to a file with root privileges?
A huge application needs, at one specific time, to perform a small number of writes to a file which requires root permissions. It is not really a file but a hardware interface which is exposed to Linux as a file.
Drop Process Privileges
I have a process that gets started by a damon running as root, now I want to “downgrade” this process’s privileges to those of your average user. Is this possible? If yes how?
MySQL Database User: Which Privileges are needed?
The short installation instruction for WordPress (“5 Minutes”) state that: