This file is indexed.

postinst is in netcat-openbsd 1.105-7ubuntu1.

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.

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#!/bin/sh -e

if [ "$1" = "configure" ]; then
    update-alternatives \
        --install /bin/nc nc /bin/nc.openbsd 50 \
        --slave /bin/netcat netcat /bin/nc.openbsd \
        --slave /usr/share/man/man1/nc.1.gz nc.1.gz \
                /usr/share/man/man1/nc_openbsd.1.gz \
        --slave /usr/share/man/man1/netcat.1.gz netcat.1.gz \
                /usr/share/man/man1/nc_openbsd.1.gz
fi