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22 Cards in this Set
- Front
- Back
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Tells the network domain server how to look up hostnames. (Normally /etc/hosts, then name server; it can be changed through netconf on RedHat)
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/etc/host.conf
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Contains a list of known hosts (in the local network). Can be used if the IP of the system is not dynamically generated. For simple hostname resolution (to dotted notation), /etc/hosts.conf normally tells the resolver to look here before asking the network nameserver, DNS or NIS.
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/etc/hosts
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Man page same as hosts_access. Read by tcpd at least.
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/etc/hosts.allow
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Man page same as hosts_access. Read by tcpd at least.
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/etc/hosts.deny
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These files are read by mingetty (and similar programs) to display a "welcome" string to the user connecting from a terminal (filename) or through a telnet session (filename.net). On RedHat they include a few lines stating the release number, name, and Kernel ID. They are used by rc.local.
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/etc/issue & /etc/issue.net
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Normally run for all run levels with level passed as argument. For example, to boot your machine in the Graphics mode (X-Server), run the following command from your command line: init 5. The runlevel 5 is starts the system in graphics mode. (RedHat)
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/etc/rc.d/rc
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Unofficial file that may be called from rc, rc.sysinit, or /etc/inittab for special local needs.
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/etc/rc.d/rc.local
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Normally the first script run for all run levels.
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/etc/rc.d/rc.sysinit
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Scripts run from rc for any run level from 1 to 5. These directories are "run-level" specific directories. When a system starts up, it identifies the run-level to be initiated, and then it calls all the startup scripts present in the specific directory for that run-level. For example, the system usually starts up and the message "entering run-level 3" is shown after the boot messages; this means that all the init scripts in the directory will be called. (RedHat)
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/etc/rc.d/rc/rcX.d
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file which contains the currently mounted filesystems.
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/proc/mount or /etc/mtab
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This changes continuously as the file /proc/mount changes. In other words, when filesystems are mounted and unmounted, the change is immediately reflected in this file.
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/etc/mtab
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Lists the filesystems currently "mountable" by the computer. This is important because when the computer boots, it runs the command mount -a, which takes care of mounting every file system marked with a "1" in the next-to-last column this file.
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/etc/fstab
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This file contains configuration for all the operations (mkdir, copy, format, etc.) on a DOS-type filesystem.
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/etc/mtools.conf
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Contains the valid group names and the users included in the specified groups. A single user can be present in more than one group if he performs multiple tasks. For example, is a user 'danial' the administrator as well as a member of the project group "project 1", then one entry in the file will look like: project1: * : group-id : danial
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/etc/group
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If the file exists, login(1) will allow access only to root. Other users will be shown the contents of this file and their logins refused.
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/etc/nologin (For RedHat,check Debian/Ubuntu)
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Holds some user account info including passwords (when not "shadowed").
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etc/passwd
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rpm command configuration. All the rpm command line options can be set together in this file so that all of the options apply globally when any rpm command is run on that system.
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/etc/rpmrc
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This file contains the device names of tty lines (one per line, without leading /dev/) on which root is allowed to login.
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/etc/securetty
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restricts users and groups to logging in from specific tty and ip connnections
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/etc/usertty
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Contains the encrypted password information for users' accounts and optionally the password aging information.
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/etc/shadow
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Holds the list of possible "shells" available to the system.
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/etc/shells
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Message Of The Day; used if an administrator wants to convey some message to all the users of a Linux server.
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/etc/motd
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