This file is indexed.

postinst is in rlwrap 0.37-5.

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

case "$1" in
  configure)
    update-alternatives \
      --install /usr/bin/readline-editor readline-editor /usr/bin/rlwrap 60 \
      --slave /usr/share/man/man1/readline-editor.1.gz readline-editor.1.gz /usr/share/man/man1/rlwrap.1.gz
    ;;
esac