这个使用YUM安装一下，不多说：
[root@rac1 mnt]# yum install unixODBC
[root@rac1 mnt]# yum install unixODBC-devel
确认unixODBC的安装，使用 isql命令，其是unixODBC自带的命令。可以使用这个命令验证unixODBC的配置。
[root@rac1 /]# isql --version
unixODBC 2.2.14
[root@rac1 /]# which isql
/usr/bin/isql
[root@rac1 /]# isql
**********************************************
* unixODBC - isql *
**********************************************
* Syntax *
* *
* isql DSN [UID [PWD]] [options] *
* *
* Options *
* *
* -b batch.(no prompting etc) *
* -dx delimit columns with x *
* -x0xXX delimit columns with XX, where *
* x is in hex, ie 0x09 is tab *
* -w wrap results in an HTML table *
* -c column names on first row. *
* (only used when -d) *
* -mn limit column display width to n *
* -v verbose. *
* -lx set locale to x *
* -q wrap char fields in dquotes *
* -3 Use ODBC 3 calls *
* -n Use new line processing *
* --version version *
* *
* Commands *
* *
* help - list tables *
* help table - list columns in table *
* help help - list all help options *
* *
* Examples *
* *
* isql WebDB MyID MyPWD -w < My.sql *
* *
* Each line in My.sql must contain *
* exactly 1 SQL command except for the *
* last line which must be blank (unless *
* -n option specified). *
* *
* Please visit; *
* *
* http://www.unixodbc.org *
* pharvey@codebydesign.com *
* nick@easysoft.com *
**********************************************
[root@rac1 /]#
freeTDS官网地址：http://www.freetds.org/
FreeTDS is a setof libraries for Unix and Linux that allows your programs to natively talk toMicrosoft SQL Server and Sybase databases.
--FreeTDS是Unix 和Linux library的一个集合，通过FreeTDS可以连接到MicrosoftSQL Server 和 Sybase DB。
[root@rac1 ~]# wget http://ibiblio.org/pub/Linux/ALPHA/freetds/current/freetds-current.tgz
--2012-03-06 10:14:43-- http://ibiblio.org/pub/Linux/ALPHA/freetds/current/freetds-current.tgz
Resolving ibiblio.org... 152.19.134.40
Connecting toibiblio.org|152.19.134.40|:80... connected.
HTTP request sent, awaiting response... 200OK
Length: 2192516 (2.1M) [application/x-gzip]
Saving to: freetds-current.tgz
100%[==========================================================>]2,192,516 43.7K/s in 37s
2012-03-06 10:15:21 (58.5 KB/s) - freetds-current.tgz saved [2192516/2192516]
2.2 安装freeTDS：
FreeTDS 的安装帮助，可以参考：
unixODBC - MS SQL Server/PHP