This file is indexed.

/etc/mysql/debian-start is in mysql-server-5.5 5.5.60-0+deb8u1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/bash
#
# This script is executed by "/etc/init.d/mysql" on every (re)start.
# 
# Changes to this file will be preserved when updating the Debian package.
#

source /usr/share/mysql/debian-start.inc.sh

MYSQL="/usr/bin/mysql --defaults-file=/etc/mysql/debian.cnf"
MYADMIN="/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf"
MYUPGRADE="/usr/bin/mysql_upgrade --defaults-extra-file=/etc/mysql/debian.cnf"
MYCHECK="/usr/bin/mysqlcheck --defaults-file=/etc/mysql/debian.cnf"
MYCHECK_SUBJECT="WARNING: mysqlcheck has found corrupt tables"
MYCHECK_PARAMS="--all-databases --fast --silent"
MYCHECK_RCPT="root"

# The following commands should be run when the server is up but in background
# where they do not block the server start and in one shell instance so that
# they run sequentially. They are supposed not to echo anything to stdout.
# If you want to disable the check for crashed tables comment
# "check_for_crashed_tables" out.  
# (There may be no output to stdout inside the background process!)
echo "Checking for tables which need an upgrade, are corrupt or were "
echo "not closed cleanly."
(
  upgrade_system_tables_if_necessary;
  check_root_accounts;
  check_for_crashed_tables;
) >&2 &

exit 0