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CentOS 7.0 - man page for eject (centos section 1)

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EJECT(1)				  User Commands 				 EJECT(1)

       eject - eject removable media

       eject [options] device|mountpoint

       Eject allows removable media (typically a CD-ROM, floppy disk, tape, JAZ, ZIP or USB disk)
       to be ejected under software control.  The command can also control some multi-disc CD-ROM
       changers,  the  auto-eject  feature  supported by some devices, and close the disc tray of
       some CD-ROM drives.

       The device corresponding to device or mountpoint is ejected.  If no name is specified, the
       default	name /dev/cdrom is used. The device may be addressed by device name (e.g. 'sda'),
       device path (e.g. '/dev/sda'), UUID=<uuid> or LABEL=<label> tags.

       There are four different methods of ejecting, depending on whether the device is a CD-ROM,
       SCSI  device, removable floppy, or tape.  By default eject tries all four methods in order
       until it succeeds.

       If device partition is specified, the whole-disk device is  used.   If  the  device  or	a
       device partition is currently mounted, it is unmounted before ejecting.

       -a, --auto on|off
	      This option controls the auto-eject mode, supported by some devices.  When enabled,
	      the drive automatically ejects when the device is closed.

       -c, --changerslot slot
	      With this option a CD slot can be selected from an ATAPI/IDE CD-ROM changer.  Linux
	      2.0  or  higher is required to use this feature. The CD-ROM drive can not be in use
	      (mounted data CD or playing a music CD) for a change request to work.  Please  also
	      note that the first slot of the changer is referred to as 0, not 1.

       -d, --default
	      List the default device name.

       -f, --floppy
	      This  option  specifies  that  the drive should be ejected using a removable floppy
	      disk eject command.

       -F, --force
	      Force eject, don't check device type.

       -h, --help
	      Print a help text and exit.

       -i, --manualeject on|off
	      This option controls locking of the hardware eject button.  When enabled, the drive
	      will not be ejected when the button is pressed.  This is useful when you are carry-
	      ing a laptop in a bag or case and don't want it to eject if the button is  inadver-
	      tently pressed.

       -p, --proc
	      This  option allow you to use /proc/mounts instead /etc/mtab. It also passes the -n
	      option to umount(1).

       -q, --tape
	      This option specifies that the drive should be ejected using a tape  drive  offline

       -m, --no-unmount
	      The option tells eject to not try to unmount at all.

       -M, --no-partitions-unmount
	      The  option  tells  eject  to  not try to unmount another partitions on partitioned
	      devices. If another partition is mounted the program will not attempt to eject  the
	      media.  It will attempt to unmount only mountpoint or mounted device given on eject
	      command line.

       -n, --noop
	      With this option the selected device is displayed but no action is performed.

       -t, --trayclose
	      With this option the drive is given a CD-ROM tray close command.	Not  all  devices
	      support this command.

       -T, --traytoggle
	      With this option the drive is given a CD-ROM tray close command if it's opened, and
	      a CD-ROM tray eject command if it's closed.  Not all devices support this  command,
	      because it uses the above CD-ROM tray close command.

       -r, --cdrom
	      This option specifies that the drive should be ejected using a CDROM eject command.

       -s, --scsi
	      This option specifies that the drive should be ejected using SCSI commands.

       -v, --verbose
	      Run in verbose mode; more information is displayed about what the command is doing.

       -V, --version
	      Display program version and exit.

       -x, --cdspeed <speed>
	      With this option the drive is given a CD-ROM select speed command.  The speed argu-
	      ment is a number indicating the desired speed (e.g. 8 for 8X speed), or 0 for maxi-
	      mum  data  rate.	 Not  all  devices  support this command and you can only specify
	      speeds that the drive is capable of.  Every time the media is changed  this  option
	      is cleared.  This option can be used alone, or with the -t and -c options.

       -X, --listspeed
	      With  this  option  the CD-ROM drive will be probed to detect the available speeds.
	      The output is a list of speeds which can be used as an argument of the  -x  option.
	      This  only works with Linux 2.6.13 or higher, on previous versions solely the maxi-
	      mum speed will be reported.  Also note that some drive may not correctly report the
	      speed and therefore this option does not work with them.

       Returns	0  if  operation  was successful, 1 if operation failed or command syntax was not

       Eject only works with devices that support one or more of the four  methods  of	ejecting.
       This  includes most CD-ROM drives (IDE, SCSI, and proprietary), some SCSI tape drives, JAZ
       drives, ZIP drives (parallel port, SCSI, and IDE versions), and LS120 removable	floppies.
       Users  have also reported success with floppy drives on Sun SPARC and Apple Macintosh sys-
       tems.  If eject does not work, it is most likely a limitation of the kernel driver for the
       device and not the eject program itself.

       The  -r,  -s,  -f, and -q options allow controlling which methods are used to eject.  More
       than one method can be specified.  If none of these options are specified,  it  tries  all
       four (this works fine in most cases).

       Eject may not always be able to determine if the device is mounted (e.g. if it has several
       names).	If the device name is a symbolic link, eject will follow the  link  and  use  the
       device that it points to.

       If  eject  determines  that  the  device  can have multiple partitions, it will attempt to
       unmount all mounted  partitions	of  the  device  before  ejecting  (see  --no-partitions-
       unmount). If an unmount fails, the program will not attempt to eject the media.

       You  can  eject an audio CD.  Some CD-ROM drives will refuse to open the tray if the drive
       is empty.  Some devices do not support the tray close command.

       If the auto-eject feature is enabled, then the drive will always be ejected after  running
       this  command.  Not all Linux kernel CD-ROM drivers support the auto-eject mode.  There is
       no way to find out the state of the auto-eject mode.

       You need appropriate privileges to access the device files.  Running as root  is  required
       to eject some devices (e.g. SCSI devices).

       Jeff Tranter <tranter@pobox.com> - original author.
       Karel Zak <kzak@redhat.com> and Michal Luscon <mluscon@redhat.com> - util-linux version.

       lsblk(8), findmnt(8), mount(8), umount(8)

       The  eject  command  is	part of the util-linux package and is available from Linux Kernel
       Archive <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.

Linux					    April 2012					 EJECT(1)
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