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# /etc/security/access.conf
# Login access control table
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# Disallow non-root logins on tty1.
- : ALL EXCEPT root : tty1

# Anybody in group 'nogroup', or users 'anonymous' and 'nobody' are denied all.
- : ALL : (nogroup) anonymous nobody

# Group 'wheel' may access root.
+ : root : (wheel)

# User 'root' should be denied to get access from all other sources.
- : root : ALL

# Group 'users' may switch to any other member of 'users'.
+ : (users) : (users)

# All other users should be denied to get access from all sources.
- : ALL : ALL