prerm 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 | #! /bin/sh
set -e
case "$1" in
remove|upgrade)
files=$(dpkg -L libstdc++6:amd64 | awk -F/ 'BEGIN {OFS="/"} /\.py$/ {$NF=sprintf("__pycache__/%s.*.py[co]", substr($NF,1,length($NF)-3)); print}')
rm -f $files
dirs=$(dpkg -L libstdc++6:amd64 | awk -F/ 'BEGIN {OFS="/"} /\.py$/ {NF--; print}' | sort -u)
find $dirs -mindepth 1 -maxdepth 1 -name __pycache__ -type d -empty | xargs -r rmdir
esac
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