isql -v -s MSSQLServer <user> <pw>
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+

DBI connect('MSSQLServer;Server=<ip>;Database=<dbname>;UID=<user>;PWD=<pw>','',...) failed: [unixODBC][Driver Manager]Data source name not found, and no default driver specified (SQL-IM002) at check_akcp_sensorprobe.pl line 358
[unixODBC][Driver Manager]Data source name not found, and no default driver specified (SQL-IM002)

[MSSQLServer]
Driver          = FreeTDS
Description     = DBTempServer sample database
Trace           = No
Server          = <ip>
Port            = 1433
Database        = <dbname>

[FreeTDS]
Description     = v0.91 with protocol v8.0
Driver          = /usr/lib64/libtdsodbc.so.0
UsageCount      = 1

[global]
        # TDS protocol version
        tds version = 4.2



        # Whether to write a TDSDUMP file for diagnostic purposes
        # (setting this to /tmp is insecure on a multi-user system)
        dump file = /tmp/freetds.log
        debug flags = 0xffff

        # Command and connection timeouts
        timeout = 10
        connect timeout = 10

        # If you get out-of-memory errors, it may mean that your client
        # is trying to allocate a huge buffer for a TEXT field.
        # Try setting 'text size' to a more reasonable limit
        text size = 64512

# A typical Sybase server
[egServer50]
        host = symachine.domain.com
        port = 5000
        tds version = 5.0

# A typical Microsoft server
[<Dbname>]
        host = ´<IP>
        port = 1433
        tds version = 7.0