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One common operation performed from the command line is to change a password. Any user can change his or her own password with the passwd command. The command prompts you for your current password. After entering your current password and pressing ENTER, you are then prompted for your new password. After entering the new password, you are asked to reenter it. This is to make sure you actually entered the password you intended to enter. Because password characters are not displayed when you type them, it is easy to make a mistake and to press a wrong key.
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$ passwd Old password: New password: Retype new password: $
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Tip From the Gnome interface you can also use the Password tool on the System menu to change your password.
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Files and directories contained on different hardware devices such as floppy disks, CDROMs, and hard disk partitions are called file systems. The Linux partition you used to install your Linux system on is called the root partition. This is where you mounted the root file system, the root directory indicated with a single slash, /.The root partition contains the main file system with a directory tree, starting from the root and spreading out to different system and user subdirectories. To access files on another file system-say, a CD-ROM disc-you need to attach that file system to your main system. Attaching a file system is called mounting the file system. You first set up an empty directory to which you want to mount the file system. Note On Red Hat, the /mnt/cdrom directory is already reserved for mounting CD-ROMs, and the /mnt/floppy directory is reserved for floppy disks. If you have more than one CDROM, numbered directories will be added, for example, /mnt/cdrom1 for the second CD-ROM.
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The Red Hat Gnome interface also provides a simple method for mounting and unmounting a CD-ROM. Simply insert the CD-ROM into your CD-ROM drive; you then see an icon labeled CD-ROM appear on the Gnome desktop. A CD-ROM is automatically mounted. A Gnome file manager window also automatically appears, which displays the contents of the CD-ROM. You can also mount and unmount the CD-ROM using a pop-up menu on the CDROM icon. Right-click it to display a pop-up menu with options to mount and unmount the CD-ROM along with other options (see Figure 4-3). Selecting Unmount Volume at the bottom of the pop-up menu will automatically unmount and eject the CD-ROM from your drive. You can access the CD-ROM you placed in your CD drive by double-clicking the CDROM icon. Your CD-ROM drive remains locked until you select the Unmount entry that is now displayed on the pop-up menu. If you do not see an icon for your CD-ROM, you must first make it user-mountable. Use fsconf or Linuxconf to select the local drive and doubleclick the CD-ROM entry in the Local volume window. Then, on the Options panel, select the user-mountable option. Click Act/Changes to register the change. Then right-click the desktop and select Rescan Desktop Shortcuts from the pop-up menu.
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Figure 4-3: Gnome CD-ROM icon You can also perform simple mount and unmount operations using the Disk Management tool accessible from the Gnome System menu. This tool will list all the file systems that can be mounted and will display buttons for mounting or unmounting them. From any shell command line, you can also easily mount and unmount file systems with the mount and umount commands. To mount your CD-ROM, you only have to enter the
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command mount and the directory /mnt/cdrom. You can then access the contents of the CDROM at the /mnt/cdrom directory.
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$ mount /mnt/cdrom
When you finish, unmount the CD-ROM with the umount command.
$ umount /mnt/cdrom
Note You can also manually mount and unmount floppy disks and hard disk partitions. See 32 for a detailed discussion.
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