This file is indexed.

postinst is in rxvt-unicode-256color 9.14-1.

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 \
        --install /usr/bin/rxvt \
            rxvt /usr/bin/urxvt 30 \
        --slave /usr/share/man/man1/rxvt.1.gz \
            rxvt.1.gz /usr/share/man/man1/urxvt.1.gz
    update-alternatives \
        --install /usr/bin/x-terminal-emulator \
            x-terminal-emulator /usr/bin/urxvt 20 \
        --slave /usr/share/man/man1/x-terminal-emulator.1.gz \
            x-terminal-emulator.1.gz /usr/share/man/man1/urxvt.1.gz

fi