http://bugs.debian.org/328113
- login(1): added securetty(5) to SEE ALSO section
(fixed Debian bug http://bugs.debian.org/325773),
-- groupadd(8), useradd(8): fix regular expression describing alloved login/group
+- groupadd(8), useradd(8): fix regular expression describing allowed login/group
names (pointed by Nicolas François <nicolas.francois@centraliens.net>)
(correct is [a-z_][a-z0-9_-]*[$]),
- groupadd(8), useradd(8): documents in CAVEATS section the limitations shadow