This file is indexed.

postinst is in gnuplot-qt 5.2.2+dfsg1-2ubuntu1.

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

set -e

if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" != "upgrade"]; then
    update-alternatives --remove gnuplot4 /usr/bin/gnuplot4-qt

    update-alternatives --install /usr/bin/gnuplot gnuplot /usr/bin/gnuplot-qt 100 \
      --slave /usr/share/man/man1/gnuplot.1.gz gnuplot.1.gz \
      /usr/share/man/man1/gnuplot-qt.1.gz \
      --slave /usr/share/gnuplot/gnuplot.gih gnuplot.gih \
      /usr/share/gnuplot/gnuplot-qt.gih
fi