prerm is in percona-xtradb-cluster-server-5.6 5.6.21-25.8-0ubuntu3.
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 | #!/bin/sh
set -e
# Automatically added by dh_installinit
if [ -x "/etc/init.d/mysql" ] || [ -e "/etc/init/mysql.conf" ]; then
invoke-rc.d mysql stop || exit $?
fi
# End automatically added section
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