1、mkdir -p /opt/oracle
2、cd /opt/oracle
3、去oracle官网下载如下三个压缩包（最好下载与orcale服务器对应版本的）

    然后传到/opt/oracle目录

    oracle-instantclient11.2-basic-11.2.0.1.0-1.x86_64.zip  
    oracle-instantclient11.2-sqlplus-11.2.0.1.0-1.x86_64.zip
    oracle-instantclient11.2-sdk-11.2.0.1.0-1.x86_64.zip
    官方地址如下：
    http://www.oracle.com/technetwork/topics/linuxsoft-082809.html （32位）
    http://www.oracle.com/technetwork/topics/linuxx86-64soft-092277.html （64位）
    下载需要oracle账户，没有就免费注册一个吧。
4、将如下内容，复制粘贴到install.sh
#!/bin/bash
#author loopeelee

yum install -y  libaio*
#不装这个包，连接的时候会报错如下：
#/opt/oracle/lib/sqlplus: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory

cd /opt/oracle
unzip oracle-instantclient11.2-basic-11.2.0.1.0-1.x86_64.zip > /dev/null 2>&1
unzip oracle-instantclient11.2-sqlplus-11.2.0.1.0-1.x86_64.zip > /dev/null 2>&1
mv instantclient_11_2/ lib
unzip oracle-instantclient11.2-sdk-11.2.0.1.0-1.x86_64.zip > /dev/null 2>&1
mv instantclient_11_2/ sdk
mkdir -p /opt/oracle/network/admin
cd /opt/oracle/network/admin

#下面的HOST = 和SERVICE_NAME = 需要根据自己值修改
echo 'wcsracdb =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.22.8)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = uerdb)
    )
  )

EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
    )
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
    )
  )' > tnsnames.ora
echo 'export ORACLE_HOME=/opt/oracle
export LD_LIBRARY_PATH=/opt/oracle/lib'>> /etc/profile

echo "Done"


5、chmod u+x install.sh

6、./install.sh

7、使环境变量立即生效

    source /etc/profile

    或者直接执行如下两条命令更好：

    export ORACLE_HOME=/opt/oracle

    export LD_LIBRARY_PATH=/opt/oracle/lib

8、测试：
    /opt/oracle/lib/sqlplus
    也可以这样/opt/oracle/lib/sqlplus user/password@wcsracdb