postrm is in ntop 3:4.1.0+dfsg1-1.
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 32 33 34 | #!/bin/sh
set -e
if [ "$1" = "purge" ] ; then
  # source debconf library
  if [ -f  /usr/share/debconf/confmodule ] ; then
    . /usr/share/debconf/confmodule
    db_purge
  fi
  # remove stored data
  if [ -d /var/lib/ntop ] ; then
    rm -rf /var/lib/ntop;
  fi
  if [ -d /var/log/ntop ] ; then
    rm -rf /var/log/ntop;
  fi
fi
# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d ntop remove >/dev/null
fi
# End automatically added section
# Automatically added by dh_installdebconf
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
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