In a Unix system, files have 3 levels of permissions — for the user who owns the file, the group-of-users that owns the file, and any system user. So, a given

In a Unix system, files have 3 levels of permissions — for the user who owns the file, the group-of-users that owns the file, and any system user. So, a given config file can have permissions so that the file owner can read and write, but other users cannot. Like your ssh keys. But ‘ps’ can be run by anyone, and it can typically access the whole command line you used.