postinst is in debianutils 4.8.4.
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 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #! /bin/sh -e
if test -z "$2" && test ! -f /etc/shells
then
cp -p /usr/share/debianutils/shells /etc/shells
fi
case "$1" in
configure)
if which update-mime >/dev/null;
then
update-mime
fi
if [ ! -e /usr/bin/which ]
then
ln -s /bin/which /usr/bin/which
fi
;;
abort-upgrade|abort-remove|abort-deconfigure)
;;
*)
echo "postinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
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