Linux/Unix Command: Eject

Eject removable media under software control

Looking over the shoulder of a man using his computer

 Enamul Hoque / Getty Images

The Linux eject utility removes non-permanent media (typically a CD-ROM, floppy disk, tape, or ZIP disk) through software control.

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.

Synopsis

The command takes the following general form:

eject -h eject [-vnrsfqp] [] eject [-vn] -d eject [-vn] -a on|off|1|0 [] eject [-vn] -c slot [] eject [-vn] -t [] eject [-vn] -x [] eject -V

Command-Line Options

This command accepts several switches that influence its mode of execution:

  • -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: 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 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.
  • -t: With this option the drive is given a CD-ROM tray-close command. Not all devices support this command.
  • -x: 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.
  • -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 command.
  • -p: This option allow you to use /proc/mounts instead /etc/mtab. It also passes the -n option to umount.
  • -V: This option causes eject to display the program version and exit.

Exit Status

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

Use the man command (% man) to see how a command is used on your particular computer.