This file is indexed.

postinst is in libstdc++6 5.3.1-14ubuntu2.

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

case "$1" in
    configure)
	docdir=/usr/share/doc/libstdc++6
	if [ -d $docdir ] && [ ! -h $docdir ]; then
	    rm -rf $docdir
	    ln -s gcc-5-base $docdir
	fi

	if [ -n "$2" ] && [ -d /usr/share/gcc-4.9 ] && dpkg --compare-versions "$2" lt 5.1.1-10; then
	    find /usr/share/gcc-4.9/python -name __pycache__ -type d -print0 | xargs -r0 rm -rf
	    find /usr/share/gcc-4.9/python -name '*.py[co]' -type f -print0 | xargs -r0 rm -f
	    find /usr/share/gcc-4.9 -empty -delete 2>/dev/null || true
	fi
esac