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I was wondering how do you know where the largest files in my system are stored.

For example---

Disk Space Used: 1GB Java: 500MB Java Percentage: 50% maybe represented in a pie chart. Maybe?

I know this maybe a feature overkill. I sometimes forget having stored things and wonder why my disk is so full.

So basically a command that will allow me to run on the file system and provide me with information on disk space used.

Please and thank you.

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up vote 24 down vote accepted

The Disk Usage Analyzer is available under Ubuntu > Accessories > Disk Usage Analyzer. It provides you with a snazzy pie graph showing what files and folders take up the most space:

enter image description here

The documentation on it is a little sparse, but you can find more information on the Ubuntu wiki, and the project page.

If you're interested in using the command line, there's du which is described here.

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Mmm. Delicious pie... – Erigami Nov 14 '12 at 15:26
Disk Usage Analyzer does not show individual files, only directories. It is very difficult to analyze a directory without this information, so it is actually of little use. – Lucio Paiva Dec 5 '14 at 15:58
Using this to find problem directories, it's fairly easy to ls -l that directory to look for large files. – Chris Marasti-Georg Dec 7 '14 at 16:01

Unless it changed recently, baobab only shows directories; check out kdirstat for an alternative that actually shows files, coloured by type.

A commandline alternative is

du -a | sort -nr | head
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The other excellent pie-graph disk usage tool is Filelight. It's a KDE app, and it's available in the repositories.

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It depends on kde-runtime and a few other KDE utilities, so it's likely not pure Qt. Thus it will probably be more suitable for Kubuntu users. – Chris Jun 27 '13 at 7:04
Ok, I'll update my answer – Ryan Thompson Jun 27 '13 at 17:15

A useful command to that helps in cases you need to determine that for specific directories from the command line:

du --max-depth=1

It gives you a list of the first depth directories and their sizes

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Another tool for this is jDiskReport (a Java app)

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Use the Disk Usage Analyser (Applications -> Accessories -> Disk Usage Analyser):

(The command is baobab).

Click Analyser -> Scan Filesystem

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The solution that @UncleZeiv proposed, is not working when there is really no more space left, since sort is using the /tmp folder when there is multiple lines to sort.

du -a | sort -nr | head
sort: write failed: /tmp/sortuCYq8E: No space left on device

An alternative, is a combination of the answer from @UncleZeiv and @Yoav Weiss plus adding another path for the temporary location:

sudo du -a | sort -nr -T /media/usb-key

Finally, my preferred solution will be a human readable one that doesn't depends on temp folder and list root directory (/):

sudo du -ah --max-depth=1  / | sort -hr
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