D. J. Bernstein

UNIX account names

This is a registry of UNIX account names. The point of this list is to prevent accidental collisions. Let me know if you have additions.

I suggest reserving

It's already a de-facto standard to use S names for site-specific SLIP accounts and P names for site-specific PPP accounts. It's also standard to use lowercase names (avoiding global names!) for site-specific user accounts. Many mail delivery programs assume that account names with uppercase letters should not receive mail.

This list also contains some suggestions for global account IDs. I suggest using odd numbers for all site-specific account IDs, so that even numbers can be safely allocated to global accounts.

Thanks to David Phillips, Michael Wolf, and Aaron Swartz for reports.