Linux "eject" Command Line Options and Examples
eject removable media
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.
eject [-vnrsfmqp] [
eject [-vn] -d
eject [-vn] -a on|off|1|0 [
eject [-vn] -c slot [
eject [-vn] -i on|off|1|0 [
eject [-vn] -t [
eject [-vn] -T [
eject [-vn] -x
eject [-vn] -X [
Command Line Options:
This option causes eject to display a brief description of the command options.
eject -h ...
This makes eject run in verbose mode; more information is displayed about what the command is doing.
eject -v ...
If invoked with this option, eject lists the default device name.
eject -d ...
This option controls the auto-eject mode, supported by some devices. When enabled, the drive automatically ejects when thedevice is closed.
eject -a ...
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 fea‐ture. 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 notethat the first slot of the changer is referred to as 0, not 1.
eject -c ...
This option controls locking of the hardware eject button. When enabled, the drive will not be ejected when the button ispressed. 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 inadver‐tently pressed.
eject -i ...
With this option the drive is given a CD-ROM tray close command. Not all devices support this command.
eject -t ...
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 thedrive is capable of. Every time the media is changed this option is cleared. This option can be used alone, or with the -t and
eject -x ...
With this option the selected device is displayed but no action is performed.
eject -n ...
This option specifies that the drive should be ejected using a CDROM eject command.
eject -r ...
This option specifies that the drive should be ejected using SCSI commands.
eject -s ...
This option specifies that the drive should be ejected using a removable floppy disk eject command.
eject -f ...
This option specifies that the drive should be ejected using a tape drive offline command.
eject -q ...
This option allow you to use /proc/mounts instead /etc/mtab. It also passes the -n option to umount(1).
eject -p ...
LONG OPTIONSAll options have corresponding long names, as listed below. The long names can be abbreviated as long as they are unique.
eject -V ...
EXAMPLESEject the default device:ejectEject a device or mount point named cdrom:eject cdromEject using device name:eject /dev/cdromEject using mount point:eject /mnt/cdrom/Eject 4th IDE device:eject hddEject first SCSI device:eject sdaEject using SCSI partition name (e.g. a ZIP drive):eject sda4Select 5th disc on multi-disc changer:eject -v -c4 /dev/cdromTurn on auto-eject on a SoundBlaster CD-ROM drive:eject -a on /dev/sbpcdEXIT STATUSReturns 0 if operation was successful, 1 if operation failed or command syntax was not valid.NOTESEject 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 flop‐pies. Users have also reported success with floppy drives on Sun SPARC and Apple Macintosh systems. If eject does not work, it ismost 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 ofthese 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 symboliclink, 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 devicebefore 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 thetray 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-ROMdrivers 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 tosupport filenames generated using shell file name completion). If the name starts with '.' or '/', it tries to open it as a devicefile or mount point. If that fails, it tries prepending '/dev/', '/media/' ,'/mnt/', '/dev/cdroms', '/dev/rdsk/', '/dev/dsk/', andfinally './' to the name, until a device file or mount point is found that can be opened. The program checks /etc/mtab for mounteddevices. If that fails, it also checks /etc/fstab for mount points of currently unmounted devices.Creating symbolic links such as /dev/cdrom or /dev/zip is recommended so that eject can determine the appropriate devices using eas‐ily remembered names.To save typing you can create a shell alias for the eject options that work for your particular setup.AUTHOREject was written by Jeff Tranter (firstname.lastname@example.org) and is released under the conditions of the GNU General Public License. See thefile COPYING and notes in the source code for details.The -x option was added by Nobuyuki Tsuchimura (email@example.com), with thanks to Roland Krivanek (firstname.lastname@example.org) andhis cdrom_speed command.The -T option was added by Sybren Stuvel (email@example.com), with big thanks to Benjamin Schwenk (firstname.lastname@example.org).The -X option was added by Eric Piel (Eric.Piel@tremplin-utc.net).
eject -m ...