postrm is in dhcpcd 1:3.2.3-9ubuntu1.
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 | #!/bin/sh -e
if [ "$1" = purge ]; then
rm -f /etc/dhcpc/resolv.conf
rm -rf /var/lib/dhcpcd
fi
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