prerm is in libapache2-mod-vhost-hash-alias 1.0-2.
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 | #!/bin/sh
set -e
if [ "$1" = "remove" -o "$1" = "purge" ]; then
if [ -e /etc/apache2/apache2.conf -a -x /usr/sbin/a2dismod ]; then
/usr/sbin/a2dismod vhost_hash_alias || true
fi
fi
exit 0
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