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Re: April's fool




>* It should be easy to make it working in some minutes (half an hour of
>configuration at most).
>* It should be harmless and reversible (of course)
>* It should last the whole day, people trying to figure that out.

# apt install sl
# ln -s /bin/ls /usr/local/bin/sl
# ln -s /usr/games/sl /usr/local/bin/ls

HTH,
Nik