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I had the problem that our monitoring showed that the "/" filesystem is >90% full. This command helped me to find out fast which subdirs are the biggest. The system has many NFS-mounts therefore the -x.
There are 11 alternatives - vote for the best!
This command give a human readable result without messing up the sorting.
If you can do better, submit your command here.
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I like to add the -h flag; at least for me this makes it more readable. The command requires root permissions, so it's necessary to either run it as root or use sudo
I should have added that using the -h command messes up the sorting! apologies. I'm sure that it's possible to pipe the output through another formatting command could produce "human readable" file sizes and avoid the -h flag...