This file is indexed.

postinst is in readline-common 6.2-8.

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 -e

install_from_default() {
  if [ ! -f $2 ]; then
    cp -p $1 $2
  fi
}

if [ "$1" = "configure" ] && [ "$2" = "" ]; then
  install_from_default /usr/share/readline/inputrc /etc/inputrc
fi