让RHEL5下的sqlplus支持回显
默认情况下在Linux上安装的oracle 10g的sqlplus不支持回显，这在使用中造成了一定的不便，为了使其支持回显功能，我们需要rlwrap
默认情况下在Linux上安装的Oracle 10g的sqlplus不支持回显，这在使用中造成了一定的不便，为了使其支持回显功能，我们需要rlwrap软件来帮忙。
首先下载rlwrap-0.30-1.el5.i386的rpm包或者源码包，然后安装即可。使用时只需在sqlplus前加上rlwrap即可，例如rlwrap sqlplus。
为了方便使用，我们可以在/home/oracle/.bashrc中为其设置别名。
alias sqlplus='rlwrap sqlplus'
alias rman='rlwrap rman'
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