System Configuration in /etc
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/etc/debian_version
Contains the debian version.
/etc/exports
This file contains information to tell NFS (Network File Systems)
which partitions are to be shared with other systems.
/etc/fstab
This file lists filesystems, possibly spread over multiple drives,
partitions, and remote hosts, that can be mounted. At boot time,
partitions identifed as auto mount will be auto mounted. Other
convenient mount rules for CD-ROMS, DVDs, Floppy drives, etc., are
usually also included.
/etc/hosts.allow
This file, and its companion /etc/hosts.deny control access
to your computer. The file /etc/hosts.allow lists hosts that
are allowed to access the system. If empty then no restrictions apply.
Similarly, /etc/hosts.deny is a list of hosts that are
not allowed to access the system.
/etc/inetd.conf
This file is the internet server configuration database and is used to
identify services like ftp and ssh which should be started. As a
security measure it is advisable to comment services which you do not
use.
/etc/inittab
This file specifies the processes that are started at bootup and at
different runlevels.
/etc/motd
This file (message of the day) is displayed when a user logs on.
/etc/passwd
This file contains user information including login name, password,
default shell, and home directory. Because this file is readable (and
needs to be readable) by everyone on the system, the password field
usually contains an x indicating that the encrypted password
is actually located in /etc/shadow, which is only readable by
the root user. See Section 73.1 for details of
sharing this information across multiple hosts.
/etc/profile
This file contains common user configurations for interactive shells,
such as global environment variables.
/etc/services
This file contains a list of network services and identifies which
port a service mentioned in /etc/inetd.conf will use.
/etc/securetty
This file lists the terminals (ttys) on which root is allowed to
login.
/etc/shells
This file contains the pathnames of all shells installed in the
system. A user is allowed to select one of these shells as their
default login shell.
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