postinst is in swat 2:3.6.3-2ubuntu2.
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 | #!/bin/sh -e
action="$1"
oldversion="$2"
# Set up swat
update-inetd --group OTHER --add \
'swat\t\tstream\ttcp\tnowait.400\troot\t/usr/sbin/tcpd\t/usr/sbin/swat'
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