postinst is in lpe 1.2.7-2ubuntu3.
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 5 6 | #! /bin/sh -e
## $MadHouse: Debian/lpe/debian/maint/postinst,v 1.1 2001/09/30 12:04:11 algernon Exp $
update-alternatives --install /usr/bin/editor editor /usr/bin/lpe 30 \
--slave /usr/share/man/man1/editor.1.gz editor.1.gz \
/usr/share/man/man1/lpe.1.gz
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