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I'll quote myself from an earlier thread of a similar list of awesome tools; this one deserves to be in it so much:

An ncurses disk usage analyzer: http://dev.yorhel.nl/ncdu

I find this an extremely handy alternative to du, it's somewhat similar to TreeView on Windows.

This tool is a must-have for any on-call sysadmin.

Must-have? Hardly. It's much easier to run `du -sm | sort -n', both of which are already installed everywhere along with coreutils.

Fair enough; "must-have" is a bit strong. But, when I'm responding to a freespace alert on one of 2000-300 servers I've never seen before, the "visualized" data layout is easier to digest than a list of numbers - plus ncdu can drill-down through a directory tree quite nicely.

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