asp.net scan barcode android The mount and umount Commands in Software

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The mount and umount Commands
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You can also mount or unmount any file system using the mount and umount commands. You enter these commands on a shell command line. In a window manager or desktop, you can open a terminal window and enter the command there, or you can simply use your login shell. The mount operations discussed in the previous sections use the mount command to mount a file system. Normally, mounting file systems can only be done as the root user (unless the device is user mountable). This is a system administration task and cannot be performed by a regular user. To mount a file system, be sure to log in as the root user. Table 32-9 lists the different options for the mount command. Table 32-9: Themount Command Description Fakes the mounting of a file system. You use it to check if a file system can be mounted. Verbose mode. Mount displays descriptions of the actions it is taking. Use with -f to check for any problems mounting a file system, -fv. Mount the file system with read and write permission. Mount the file system with only read permission. Mount the file system without placing an entry for it in the mstab file. Specify the type of file system to be mounted. See Table 32-7 for valid file system types. Mount all file systems listed in /etc/fstab. Mount the file system using a list of options. This is a commaseparated list of options following -o. See Table 32-8 for a list of the options and the Man pages for mount.
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Mount Option -f -v -w -r -n -t type -a -o option-list
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The mount command takes two arguments: the storage device through which Linux accesses the file system, and the directory in the file structure to which the new file system is attached.
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The mountpoint is the directory on your main directory tree where you want the files on the storage device attached. The device is a special device file that connects your system to the hardware device. The syntax for the mount command is as follows:
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# mount device mountpoint
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Device files are located in the /dev directories and usually have abbreviated names ending with the number of the device. For example, fd0 may reference the first floppy drive attached to your system. On Linux systems operating on PCs, the hard disk partitions have a prefix of hd, followed by an alphabetic character that labels the hard drive, and then a number for the partition. For example, hda2 references the second partition on the first hard drive. In most cases, you can use the man command with a prefix to obtain more detailed information about that kind of device. For example, man sd displays the Man pages for SCSI devices. The following example mounts a floppy disk in the first floppy drive device (fd0) to the /mydir directory. The mountpoint directory needs to be empty. If you already have a file system mounted there, you will receive a message that another file system is already mounted there and that the directory is busy. If you mount a file system to a directory that already has files and subdirectories in it, those will be bypassed, giving you access only to the files in the mounted file system. Unmounting the file system restores access to the original directory files.
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# mount /dev/fd0 /mydir
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For any partition with an entry in the /etc/fstab file, you can mount it using only the mount directory specified in its fstab entry. You needn't enter the device filename. The mount command looks up the entry for it in the fstab file, using the directory to identify the entry and, in that way, find the device name. For example, to unmount the /dev/hda1 DOS partition in the previous example, the mount command only needs to know the directory it is mounted to-in this case, /mnt/dos.
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