postrm is in command-not-found 0.2.38-4.
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 | #!/bin/sh
set -e
if [ "$1" = "purge" ]; then
rm -rf /var/cache/command-not-found || exit 1
fi
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