eject(1) — Linux manual page


EJECT(1)                      User Commands                     EJECT(1)

NAME         top

       eject - eject removable media

SYNOPSIS         top

       eject [options] device|mountpoint

DESCRIPTION         top

       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

       If a device partition is specified, the whole-disk device is

       If the device or a device partition is currently mounted, it is
       unmounted before ejecting.  The eject is processed on exclusive
       open block device file descriptor if --no-unmount or --force are
       not specified.

OPTIONS         top

       -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.  The CD-ROM drive cannot 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, --force
              Force eject, don't check device type, don't open device
              with exclusive lock.  The successful result may be false
              positive on non hot-pluggable devices.

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

       -h, --help
              Display 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 carrying a
              laptop in a bag or case and don't want it to eject if the
              button is inadvertently pressed.

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

       -m, --no-unmount
              The option tells eject to not try to unmount at all.  If
              this option is not specified than eject opens the device
              with O_EXCL flag to be sure that the device is not used
              (since v2.35).

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

       -p, --proc
              This option allows you to use /proc/mounts instead
              /etc/mtab.  It also passes the -n option to umount(8).

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

       -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.

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

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

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

       -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 maximum speed will be reported.  Also
              note that some drives may not correctly report the speed
              and therefore this option does not work with them.

       -x, --cdspeed 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

EXIT STATUS         top

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

NOTES         top

       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 (see also --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

AUTHORS         top

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

SEE ALSO         top

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

AVAILABILITY         top

       The eject command is part of the util-linux package and is
       available from Linux Kernel Archive 

COLOPHON         top

       This page is part of the util-linux (a random collection of Linux
       utilities) project.  Information about the project can be found
       at ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.  If you
       have a bug report for this manual page, send it to
       util-linux@vger.kernel.org.  This page was obtained from the
       project's upstream Git repository
       ⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
       2021-03-21.  (At that time, the date of the most recent commit
       that was found in the repository was 2021-03-19.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to man-pages@man7.org

Linux                          April 2012                       EJECT(1)