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Old 05-05-2009, 06:10 AM   #1
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how to access the cdRom or any usb device by shell

how to access the cdRom or any usb device by shell without using the gui
Old 05-05-2009, 06:21 AM   #2
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In short:

1) mount device
2) cd to mountpoint
3) do your thing
4) cd to other dir
5) umount device

Some distro's come with auto mounting, which means that the cdrom/usb device will be mounted the moment you insert them.

If that is not the case:

1) find out which device needs to be mounted (/dev/sr0 could be your cdrom player. /dev/sdb1 /dev/sdc2 could be your usb device),
2) mount device with proper options: mount -t vfat /dev/sdc1 /mnt/usb (mount point [/mnt/usb in this example] must already exist.
-t vfat is just an example (mount a usb device that holds a dos fs). See manpage for details.
Check your /etc/fstab to see if some of the devices (/dev/sdX, /dev/srX) are already present. If so, you can use a shortcut: mount /dev/sdcX (no extra options needed).

Unmounting is simpler: umount /dev/sdX (that is umount not unmount!)

Hope this helps.
Old 05-05-2009, 06:22 AM   #3
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There are probably alot of ways....

You could use "mount", "df -h", "fdisk -l"(as sudo), and I'm sure more knowledgeable people here than me can tell you.

Welcome to LQ!

Please post your hardware specs and what you're trying to accomplish?
Include as much info as you can...
Old 05-05-2009, 06:24 AM   #4
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First you have to mount the device, if the system doesn't mount it automatically. Insert the cd or the usb device, wait for some seconds, then use the command mount without arguments to check if the device is already mounted or not:
# mount
/dev/sda1 on /media/USB DISK type vfat (rw,noexec,nosuid,nodev,shortname=winnt,uid=502)
this example shows a usb device mounted in "/media/USB DISK". So you can check the mount point and access it as usual. The same for a CD/DVD. If you have to mount it manually you can check the output of fdisk -l, look for the device name and the filesystem type, then mount it using an existing directory a mount point (for example /mnt).
# fdisk -l
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1         250     2007008+   6  FAT16
# mount /dev/sda1 /mnt
# cd /mnt
If you insert a CD in most cases it is mounted automatically. If not, you can use /dev/cdrom as device, since it exists on all system and usually is a link to a physical device (in this case you don't see the CD device using fdisk -l):
# mount /dev/cdrom /mnt
# cd /mnt
When you've finished, unmount the device using the umount command giving either the mount point or the device name as argument.
Hope this helps.

Last edited by colucix; 05-05-2009 at 06:27 AM.


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