mysql> show variables like 'log_slow_queries';
+------------------+-------+
| Variable_name | Value |
+------------------+-------+
| log_slow_queries | OFF | 
+------------------+-------+
1 row in set (0.01 sec)

mysql> 

long_query_time=1
log-slow-queries=/var/mysql/logs/slow.log

[root@localhost mysqlsla-2.03]# more /etc/my.cnf 
[mysqld]
datadir=/var/lib/mysql
log_bin=/tmp/mysql/bin-log/mysql-bin.log
log_bin=ON
socket=/var/lib/mysql/mysql.sock
user=mysql
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1


log_slow_queries=/tmp/127_slow.log
long_query_time=1
log_queries_not_using_indexes

.......

mysql> show variables like 'log_slow_queries';
+------------------+-------+
| Variable_name | Value |
+------------------+-------+
| log_slow_queries | ON | 
+------------------+-------+
1 row in set (0.00 sec)

mysql> show variables like 'long_query_time';
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| long_query_time | 2  | 
+-----------------+-------+
1 row in set (0.00 sec)

mysql>