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I want to know how to umount my USB drive via command line. I am using Ubuntu 12.04 LTS 32-bit.

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2  
Have you looked at man umount? – jasonwryan Aug 19 '12 at 8:14
Do you want to umount it via commandline or using a graphical interface? – student Aug 19 '12 at 8:20
via command-line – Pranit Bauva Aug 19 '12 at 8:27

2 Answers

up vote 11 down vote accepted

Suppose your usb drive is mounted to /media/usb then it would be sufficient to do 

sudo umount /media/usb

Suppose the your usb is /dev/sdb1 then you could also do

sudo umount /dev/sdb1

You may also have a look at the anwers of one of my questions, how to umount all attached usb devices with a single command: Umount all attached usb disks with a single command

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It just works! Thanks a lot! – Pranit Bauva Aug 19 '12 at 8:40
up vote 1 down vote

You can also use

udisks --unmount /dev/sdb1

which does not require root.

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