假如我的安装路径如下：/home/lxm/app/lxm/product/11.2.0/dbhome_1/bin 那么在/home/lxm/.bash_profile 文件中添加如下内容： export oracle_base=/home/lxm/app/lxm export oracle_home=$oracle_base/product/11.2.0/dbhome_1 export oracle_sid=orcl expo
假如我的安装路径如下：/home/lxm/app/lxm/product/11.2.0/dbhome_1/bin
那么在 /home/lxm/.bash_profile
文件中添加如下内容：
export oracle_base=/home/lxm/app/lxm
export oracle_home=$oracle_base/product/11.2.0/dbhome_1
export oracle_sid=orcl    
export path=$path:$home/bin:$oracle_home/bin
export ld_library_path=$oracle_home/lib:/lib:/usr/lib
然后执行：soruce  /home/lxm/.bash_profile
使其生效即可
输入sqlplus /nolog
出现如下提示：
[lxm@wn7-lcg /]$ sqlplus /nolog
sql*plus: release 11.2.0.1.0 production on mon oct 15 14:10:56 2012
copyright (c) 1982, 2009, oracle.  all rights reserved.
sql>
就成功了