How to check mysql dsn entry in Linux box

isql -v mydsn myusername mypassword

​[root@linuxmysql opt]# isql -v analyt_52 reuser resuer
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+
SQL>    
​