postinst is in epic4-script-lice 1:4.2.5i-2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh -e
update-alternatives --install /etc/epic4/default.irc epic4-default.irc \
/usr/share/epic4/lice/lice.irc 20
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