postrm is in socklog 2.1.0-8.
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 | #!/bin/sh
set -e
test "$1" = 'purge' || exit 0
getent passwd log >/dev/null || exit 0
! deluser --version >/dev/null 2>&1 || exec deluser log
echo 'deluser program not available, not removing system user "log".' >&2
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