How can I check how much disk space I'm using? Is there a command to check how much disk space is being used by a user?

You can find out how much disk space is in a particular directory (such as someone's home directory) with the command du -sk, if you have permissions on that directory -- if it's yours or if it's world-readable. You can also check the directory /lusr/share/doc/disk-usage for reports on who's using how much space on specific disks, although that information is updated hourly, not in real-time.

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