postrm is in libsnmp-base 5.4.3~dfsg-2.4ubuntu1.
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 | #! /bin/sh
set -e
# Remove /var/lib/snmp if being purged.
[ "$1" = purge ] && rm -fr /var/lib/snmp
exit 0
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