postrm is in ifupdown 0.7~beta2ubuntu8.
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
set -e
case "$1" in
purge)
# Note: We don't remove /etc/network/interfaces
rm -f /etc/network/run/ifstate
if [ -L /etc/network/run ] ; then
rm -f /etc/network/run
elif [ -d /etc/network/run ] ; then
rmdir --ignore-fail-on-non-empty /etc/network/run
fi
;;
esac
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