`system("mysql --host=$db_host --user=$db_user --password=$db_password -v -v -v $database < ../update.sql");`

--------------
ALTER TABLE `phppos_customers` ADD `current_sales_for_discount` int(10) NOT NULL DEFAULT '0' AFTER `current_spend_for_points`
--------------

Terminal close -- sending "KILL QUERY 966" to server ...
Terminal close -- query aborted
Aborted

mysql> SHOW VARIABLES LIKE "%_timeout";
+-----------------------------+----------+
| Variable_name               | Value    |
+-----------------------------+----------+
| connect_timeout             | 10       |
| delayed_insert_timeout      | 300      |
| have_statement_timeout      | YES      |
| innodb_flush_log_at_timeout | 1        |
| innodb_lock_wait_timeout    | 50       |
| innodb_rollback_on_timeout  | OFF      |
| interactive_timeout         | 28800    |
| lock_wait_timeout           | 31536000 |
| net_read_timeout            | 30       |
| net_write_timeout           | 60       |
| rpl_stop_slave_timeout      | 31536000 |
| slave_net_timeout           | 60       |
| wait_timeout                | 28800    |
+-----------------------------+----------+
13 rows in set (0.00 sec)