prerm is in percona-xtradb-cluster-server-5.7 5.7.20-29.24-0ubuntu2.
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 | #!/bin/sh
set -e
# Automatically added by dh_installinit/11.1.4ubuntu1
if [ -x "/etc/init.d/mysql@" ]; then
invoke-rc.d mysql@ stop || exit 1
fi
# End automatically added section
# Automatically added by dh_installinit/11.1.4ubuntu1
if [ -x "/etc/init.d/mysql" ]; then
invoke-rc.d mysql stop || exit 1
fi
# End automatically added section
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