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 a 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. The eject is processed on exclusive open block device file descriptor if --no-unmount or --force are not specified.
-a, --auto on|off
-c, --changerslot slot
-i, --manualeject on|off
-x, --cdspeed speed
Returns 0 if operation was successful, 1 if operation failed or command syntax was not valid.
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 devices).
Jeff Tranter <email@example.com> - original author, Karel Zak <firstname.lastname@example.org> and Michal Luscon <email@example.com> - util-linux version.
For bug reports, use the issue tracker at <https://github.com/util-linux/util-linux/issues>.
The eject command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.