I think that, writing a destructive programm doesn't show skill but
immaturenes. Writing a virus for educational purposes can be
interesting, as it requires fiddling around on a low level. OTOH
on a sanely designed system you will hardly find executables you
can overwrite without root permission. And if $HOME is on a
parition mounted with the "noexec", option then it's almost
impossible to get malcode permanently on the system.
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