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Your Linux file system is organized into directories whose files are used for different system functions (see Table 1-6). For basic system administration, you should be familiar with the system program directories where applications
Directories /bin /sbin /lib /etc /home Description System-related programs System programs for specialized tasks System libraries Configuration files for system and network services and applications The location of user home directories and server data directories, such as Web and FTP site files The location where CD-ROM and floppy disk files systems are mounted ( 4) The location of system directories whose files continually change, such as logs, printer spool files, and lock files ( 4) User-related programs and files. Includes several key subdirectories, such as /usr/bin, /usr/X11, and /usr/doc Programs for users Device files ( 7) X Window System configuration files Shared files Directory for system temporary files System Directories
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/mnt /var
/usr
/usr/bin /dev /usr/X11 /usr/share /tmp Table 1-6.
/usr/share/doc Documentation for applications
22 Red Hat Linux Pocket Administrator
are kept, the system configuration directory (/etc) where most configuration files are placed, and the system log directory (/var/log) that holds the system logs, recording activity on your system. Other system directories are covered in their respective chapters, with many discussed in 4.
Program Directories
Directories with bin in the name are used to hold programs. The /bin directory holds basic user programs, such as login, shells (bash, tcsh, and zsh), and file commands (cp, mv, rm, ln, and so on). The /sbin directory holds specialized system programs for such tasks as file system management (fsck, fdisk, mkfs) and system operations like shutdown and startup (init). The /usr/bin directory holds program files designed for user tasks. The /usr/sbin directory holds user-related system operations, such as useradd to add new users. The /lib directory holds all the libraries your system makes use of, including the main Linux library, libc, and subdirectories such as modules, which holds all the current kernel modules.
Configuration Directories and Files
When you configure different elements of your system, like users, applications, servers, or network connections, you make use of configuration files kept in certain system directories. On Red Hat, configuration files are placed in the /etc directory, with more specific device and service configurations located in the /etc/sysconfig directory .
Configuration Files: /etc
The /etc directory holds your system, network, server, and application configuration files. Here, you can find the fstab file listing your file systems, the hosts file with IP addresses for hosts on your system, and grub.conf for the boot systems supported by the GRUB boot loader. This directory includes various subdirectories, such as /apache for the Apache web server configuration files
Basic System Administration
and /X11 for the X Window System and window manager configuration files. You can configure many applications and services by directly editing their configuration files, though it is best to use a corresponding administration tool, like those provided by Red Hat. Table 1-7 lists several commonly used configuration files found in the /etc directory.
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
File /etc/inittab /etc/passwd /etc/shadow /etc/group /etc/fstab /etc/grub.conf /etc/modules.conf /etc/printcap /etc/termcap
Description Sets the default state, as well as terminal connections Contains user password and login configurations Contains user-encrypted passwords Contains a list of groups with configurations for each Automatically mounts file systems when you start your system The GRUB configuration file for the GRUB boot loader Modules on your system to be automatically loaded Contains a list of each printer and its specifications Contains a list of terminal type specifications for terminals that could be connected to the system Directory that holds the versions of initialization files, such as .bash_profile, which are copied to new users home directories Services run on the system and the ports they use Default shell configuration file for users Shells installed on the system that users can use
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