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How to understand what's taking up space?

Hi, I am using Ubuntu 10.10.
I have 40G of disk space in my partition /home and have used up 10 G of it, so I should have 30G left. But somehow disk space disappeared almost completely. I don't know what ate up the disk space. I checked with ps ax and then du and couldn't find strange activities.
I would need to reboot the system to recover the free space! Any ideas?

marked as duplicate by Michael Mrozek Dec 27 '10 at 3:58

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  • If the free space is back after a reboot I highly doubt /tmp. Maybe some program creates large temporary files in there. Try running Accessories > Disk Usage Analyzer and see which file is taking up the space. – phunehehe Dec 27 '10 at 3:00
  • I agree with phunehehe. There are a number of good ideas for finding out what's taking up space in this question; I think answers to this will probably just be duplicates of that, so I'm going to close it – Michael Mrozek Dec 27 '10 at 3:58

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