postinst is in libstdc++6 8-20180414-1ubuntu2.
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 12 13 14 15 16 | #! /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-8-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
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