This file is indexed.

postinst is in qt4-linguist-tools 4:4.8.1-0ubuntu4.

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

update-alternatives --install \
    /usr/bin/lupdate lupdate "/usr/bin/lupdate-qt4" "40" \
    --slave /usr/share/man/man1/lupdate.1.gz lupdate.1.gz \
    "/usr/share/man/man1/lupdate-qt4.1.gz"

update-alternatives --install \
    /usr/bin/lrelease lrelease "/usr/bin/lrelease-qt4" "40" \
    --slave /usr/share/man/man1/lrelease.1.gz lrelease.1.gz \
    "/usr/share/man/man1/lrelease-qt4.1.gz"