How to check the disk space used

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To look at your quota go to your $HOME (cd /home/username/) and use the keywords:

du -s -B MB

that will give your quota in Megabytes.

If you are out of your quota you will need to delete some files. If your are close to the limit you can delete some files and compress some others. There are several ways to compress files, you might want to use: gzip, tar, ...