CentOS

Hi,

I'm using CentOS 7.6 Gnome Desktop.

I'm using multiple hdd's and partitions.
How do I change permissions recursively for a single user on a whole partirion, even from terminal?

Both 'chmod' and 'chown' support recursive option '-R'.
Use it with caution or you can break software.

Well I don't want to take ownership for a partition or folder; it should be root, so chown probably isn't the command of chouce.

I had found that 'chmod -R 755 /path or 'folder name' changes to read/write permissions, but what do I need to input for a single user or group in such chmod command?

You are not even trying: man chmod or man chown