This file is indexed.

postinst is in mawk 1.3.3-17.

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 --quiet --install /usr/bin/awk awk /usr/bin/mawk 5 \
  --slave /usr/share/man/man1/awk.1.gz awk.1.gz /usr/share/man/man1/mawk.1.gz \
  --slave /usr/bin/nawk nawk /usr/bin/mawk \
  --slave /usr/share/man/man1/nawk.1.gz nawk.1.gz /usr/share/man/man1/mawk.1.gz