Hi Maciej,
The AT daemon comes pre-installed with OpenSUSE Linux (one of the reasons it's our recommended distro) but not with others. In Ubuntu or Debian, try
sudo apt-get install at
Once the software is installed, you need to tell Linux to run it constantly in the background (that's what is meant by daemon).
I am not totally familiar with Ubuntu, but you can try this
sudo update-rc.d atd defaults
then try testing at:
at now echo "Maciej" > $HOME/test.txt (hit control D)
If at has worked, you should see the file $HOME/text.txt has been created and contains Maciej inside it.
David
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