This file is indexed.

postinst is in pinentry-qt4 0.8.3-1ubuntu1.

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 ]; then
	update-alternatives --quiet \
	  --install /usr/bin/pinentry pinentry /usr/bin/pinentry-qt4 95 \
	  --slave /usr/share/man/man1/pinentry.1.gz pinentry.1.gz /usr/share/man/man1/pinentry-qt4.1.gz
	update-alternatives --quiet \
	  --install /usr/bin/pinentry-x11 pinentry-x11 /usr/bin/pinentry-qt4 95 \
	  --slave /usr/share/man/man1/pinentry-x11.1.gz pinentry-x11.1.gz /usr/share/man/man1/pinentry-qt4.1.gz
fi