Is there a way in Unix to see the biggest directories on disk ?
I need to know why I'm almost done with the space on the server, and I dunno where most of the space is used..
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My favorite tool for this task is ncdu.
I suggest you to use baobab, which will give you a graphical overview of your disk usage. It can also be used for remote folder (through ssh, ftp,...) to scan the disk usage on a remote server for instance.
Edit: If you would like to investigate the disk usage directly on the server with your shell access and not remotely, and you would like a tool more convenient than
du, you can also have a try with durep which will generate a report of the disk usage with bar graphs.
I'm regularly running
du -dak > du-dak.out at the top of each file system. Then, I can get a graphical display with
xdu < du-dak.out. This can be done remotely after transferring the du-dak.out file over the network should you only have text access.