postinst is in readline-common 6.3-4ubuntu2.
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.
1 2 3 4 5 6 7 8 9 10 11 | #! /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
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