Peterbe.com

This took some time to figure out (found answer here)and it might come in handy sometime in the far future so I write it down here and now.
To create a user for the postgresql database on linux you have to do that from the linux user called postgres.

This would not work:

peterbe@computer:~$ createuser peterbe

What you need to do is this:

peterbe@computer:~$ su -
...log in as root...
computer:~# su postgres
computer:/root$ createuser peterbe

Now I know!

The Linux Cookbook: Tips and Techniques for Everyday Use

I just love cookbooks. A cookbook doesn't have to be about food you know. This one is about little useful tips on how to use your Linux computer.

From this I learnt how to find all really large files which is useful if you want to find out why causes your harddrive to be so surprisingly full:

$ find /usr/local -size +10000k [RET]