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eject - Online in the Cloud

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This is the command eject that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



eject - eject removable media


eject -h
eject [-vnrsfmqp] [<name>]
eject [-vn] -d
eject [-vn] -a on|off|1|0 [<name>]
eject [-vn] -c slot [<name>]
eject [-vn] -i on|off|1|0 [<name>]
eject [-vn] -t [<name>]
eject [-vn] -T [<name>]
eject [-vn] -x <speed> [<name>]
eject [-vn] -X [<name>]
eject -V


Eject allows removable media (typically a CD-ROM, floppy disk, tape, or JAZ or ZIP 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 <name> is ejected. The name can be a device file or mount
point, either a full path or with the leading "/dev", "/media" or "/mnt" omitted. If no
name is specified, the default name "cdrom" is used.

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 the device is currently mounted, it is unmounted before ejecting.


-h This option causes eject to display a brief description of the command options.

-v This makes eject run in verbose mode; more information is displayed about what the
command is doing.

-d If invoked with this option, eject lists the default device name.

-a on|1|off|0
This option controls the auto-eject mode, supported by some devices. When enabled,
the drive automatically ejects when the device is closed.

-c <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.

-i on|1|off|0
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 carrying
a laptop in a bag or case and don't want it to eject if the button is inadvertently

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

-T 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.

-x <speed>
With this option the drive is given a CD-ROM select speed command. The speed
argument is a number indicating the desired speed (e.g. 8 for 8X speed), or 0 for
maximum 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 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 maximum speed
will be reported. Also note that some drive may not correctly report the speed and
therefore this option does not work with them.

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

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

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

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

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

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

-m This option allows eject to work with device drivers which automatically mount
removable media and therefore must be always mount(1)ed. The option tells eject to
not try to unmount the given device, even if it is mounted according to /etc/mtab or

-V This option causes eject to display the program version and exit.


All options have corresponding long names, as listed below. The long names can be
abbreviated as long as they are unique.

-h --help
-v --verbose
-d --default
-a --auto
-c --changerslot
-t --trayclose
-T --traytoggle
-x --cdspeed
-X --listspeed
-n --noop
-r --cdrom
-s --scsi
-f --floppy
-q --tape
-V --version
-p --proc
-m --no-unmount


Eject the default device:


Eject a device or mount point named cdrom:

eject cdrom

Eject using device name:

eject /dev/cdrom

Eject using mount point:

eject /mnt/cdrom/

Eject 4th IDE device:

eject hdd

Eject first SCSI device:

eject sda

Eject using SCSI partition name (e.g. a ZIP drive):

eject sda4

Select 5th disc on multi-disc changer:

eject -v -c4 /dev/cdrom

Turn on auto-eject on a SoundBlaster CD-ROM drive:

eject -a on /dev/sbpcd


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
systems. 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. 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 or setuid root
is required to eject some devices (e.g. SCSI devices).

The heuristic used to find a device, given a name, is as follows. If the name ends in a
trailing slash, it is removed (this is to support filenames generated using shell file
name completion). If the name starts with '.' or '/', it tries to open it as a device file
or mount point. If that fails, it tries prepending '/dev/', '/media/' ,'/mnt/',
'/dev/cdroms', '/dev/rdsk/', '/dev/dsk/', and finally './' to the name, until a device
file or mount point is found that can be opened. The program checks /etc/mtab for mounted
devices. If that fails, it also checks /etc/fstab for mount points of currently unmounted

Creating symbolic links such as /dev/cdrom or /dev/zip is recommended so that eject can
determine the appropriate devices using easily remembered names.

To save typing you can create a shell alias for the eject options that work for your
particular setup.

Use eject online using onworks.net services

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