在Linux上，安装完成之后，在测试RMAN时可能会遇到如下错误：
[oracle@smsdbrac1 oracle]$ rman target /
rman: can't open target
这是由于调用的是非Oracle的RMAN的缘故：
[oracle@smsdbrac1 oracle]$ which rman
/usr/X11R6/bin/rman
在X11R6下存在一个名为rman的命令：
[oracle@smsdbrac1 bin]$ ./rman -help
rman
[-f
]
[-S(ource of man page passed in)] [-F(ormatted man page passed in)]
[-r ] [-l ]
<br> [-V(olume) <colon-separated list>] [-U(RLs as hyperlinks)]
<br> [-b (show subsections)] [-k(eep head/foot)]
<br> [-n(ame of man page) <string>] [-s(ection) <string>]
<br> [-p(aragraph mode toggle)] [-t(abstops spacing) <number>]
<br> [-N(ormalize spacing, changebars)] [-y (zap hyphens toggle)]
<br> [-K (declare that page has no breaks)]
<br> [-d(iff) <file> (diff of old page source to incorporate)]
<br> [-M(essage) <text> (included verbatim at end of Name section)]
<br> [-R(ebus words for TkMan)] [-C (enable Tcl/Tk formatting)]
<br> [-o (no op)] [-O <arg> (no op with arg)]
<br> [-q(uiet--don't report warnings)] [-h(elp)] [-v(ersion)]
<br> [<filename>]
<br>
<br>修正这个问题，我们只需要在Oracle用户的环境变量下，将$ORACLE_HOME/bin放在PATH变量前就可以了：
<br>
<br>export PATH=$ORACLE_HOME/bin:${PATH}:/usr/bin:/bin:/usr/bin/X11:/usr/local/bin
<br>
<br>重新登录使环境变量生效，现在Oracle能找到正确的rman了：
<br>
<br>[oracle@smsdbrac1 oracle]$ su - oracle
<br>Password:
<br>[oracle@smsdbrac1 oracle]$ which rman
<br>~/product/10.2.0/db/bin/rman
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