postinst is in jetty 6.1.26-1ubuntu1.
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 29 30 31 | #!/bin/sh
set -e
case "$1" in
    configure)
	if ! id jetty > /dev/null 2>&1 ; then
	    adduser --system --home /usr/share/jetty --no-create-home \
		--group --disabled-password --shell /bin/false \
		jetty
	fi
	chown -R jetty:adm /var/cache/jetty /var/log/jetty /var/lib/jetty
	chmod 750 /var/log/jetty
    ;;
    abort-upgrade|abort-remove|abort-deconfigure)
    ;;
    *)
	echo "$0 called with unknown argument \`$1'" >&2
	exit 1
    ;;
esac
# Automatically added by dh_installinit
if [ -x "/etc/init.d/jetty" ]; then
	if [ ! -e "/etc/init/jetty.conf" ]; then
		update-rc.d jetty defaults >/dev/null
	fi
	invoke-rc.d jetty start || exit $?
fi
# End automatically added section
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