prerm is in sysklogd 1.5-6ubuntu1.
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 11 12 13 14 15 16 17 18 | #! /bin/sh
set -e
if [ \( "$1" = "upgrade" -o "$1" = "remove" \) -a -L /usr/doc/sysklogd ]
then
    rm -f /usr/doc/sysklogd
fi
if [ "$1" = "purge"  -o "$1" = "remove" ]
then
    if [ -x /usr/sbin/invoke-rc.d ]
    then
	invoke-rc.d sysklogd stop
    else
	sh /etc/init.d/sysklogd stop
    fi
fi
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