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Unix for Advanced Users
2. Logging In
2.1.
Who is watching for logins
2.1.1
On serial ports: the
getty
process
2.1.2
On networks: the
inetd/in.telnetd
processes
2.1.3
On networks: the
sshd
process
2.2.
The process controlling logins:
/bin/login
2.3.
Who is permitted:
/etc/passwd
,
/etc/shadow
, and
/etc/group
2.3.1.
What is
/etc/passwd
?
2.3.2.
What is
/etc/shadow
?
2.3.3.
What is
/etc/group
?
2.4.
Where am I now: The login shell
2.5.
The dotfiles
2.6.
Common problems when logging in:
2.6.1.
An unreachable machine
2.6.2.
An absent service or a disabled account
2.6.3.
A bad shell or a botched dotfile
2.6.4.
/etc/shells (
ftp
)
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