Free web hosting music - 134 Part II . Running the Show Exploring
134 Part II . Running the Show Exploring Administrative Commands, Configuration Files, and Log Files You can expect to find many commands, configuration files, and log files in the same places in the file system, regardless of which Linux distribution you are using. The following sections give you some pointers on where to look for these important elements. Administrative Commands Only the root user is intended to use many administrative commands. When you log in as root (or use su - from the shell to become root), your $PATH variable is set to include some directories that contain commands for the root user. These include the following: . /sbin Contains commands for modifying your disk partitions (such as fdisk), checking file systems (fsck), and changing system states (init). . /usr/sbin Contains commands for managing user accounts (such as useradd) and adding mount points for automounting file systems (automount). Commands that run as daemon processes are also contained in this directory. (Look for commands that end in d, such as sshd, pppd, and cupsd.) Some administrative commands are contained in regular user directories (such as /bin and /usr/bin). This is especially true of commands that have some options available to everyone. An example is the /bin/mount command, which anyone can use to list mounted file systems, but only root can use to mount file systems. (Some desktops, however, are configured to let regular users use mount to mount CDs, DVDs, or other removable media.) To find commands that are intended primarily for the system administrator, check out the section 8 manual pages (usually in /usr/share/man/man8). They contain descriptions and options for most Linux administrative commands. Some third-party applications will add administrative commands to directories that are not in your PATH. For example, an application may put commands in /usr/local/bin, /opt/bin, or /usr/local/sbin. In those cases, you may need to add those directories to your PATH. Administrative Configuration Files Configuration files are another mainstay of Linux administration. Almost everything you set up for your particular computer user accounts, network addresses, or GUI preferences is stored in plain-text files. This has some advantages and some disadvantages.
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