prerm is in dovecot-imapd 1:2.2.33.2-1ubuntu4.
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
if [ -d /run/systemd/system ]; then
deb-systemd-invoke stop dovecot.socket || true
fi
if [ -x "/etc/init.d/dovecot" ]; then
invoke-rc.d dovecot stop
fi
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