postinst is in inetutils-telnetd 2:1.9.4-1build1.
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 | #!/bin/sh
set -e
if [ "$1" = "configure" ]; then
if [ -x "$(which update-inetd)" ]; then
update-inetd --group STANDARD \
--add "#<off># telnet\tstream\ttcp\tnowait\troot\t/usr/sbin/tcpd\t/usr/sbin/telnetd"
fi
fi
exit 0
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