postrm is in postgresql-client-common 154ubuntu1.1.
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 | #!/bin/sh
set -e
if [ "$1" = purge ]; then
# remove psql history file
rm -f /var/lib/postgresql/.psql_history
rmdir /var/lib/postgresql/ 2>/dev/null || true
fi
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