prerm is in 389-ds-base 1.3.2.16-0ubuntu1.
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 19 | #!/bin/sh -e
set -e
# Automatically added by dh_installinit
if [ -x "/etc/init.d/dirsrv" ] || [ -e "/etc/init/dirsrv.conf" ]; then
	invoke-rc.d dirsrv stop || invoke_failure
fi
# End automatically added section
if [ "$1" = "purge" ]; then
    # remove all installed instances
    for FILE in `ls -d $CONFDIR/slapd-* 2>/dev/null | sed -n '/\.removed$/!$'`
    do
        if [ -d "$FILE" ] ; then
            remove-ds -f -i $FILE
        fi
    done
fi
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