RMAN的"rman: can't open target"错误解决
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在Linux上，安装完成之后，在测试RMAN时可能会遇到如下错误：
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[oracle@oracle10g ~]$ rman target /
rman: can't open target
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[oracle@oracle10g ~]$ which rman
/usr/X11R6/bin/rman
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在X11R6下存在一个名为rman的命令：
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[oracle@oracle10g bin]$ ./rman -help
rman
[-f ]
[-S(ource of man page passed in)] [-F(ormatted man page passed in)]
[-r ] [-l ]
[-V(olume) <colon-separated list>] [-U(RLs as hyperlinks)]
[-b (show subsections)] [-k(eep head/foot)]
[-n(ame of man page) <string>] [-s(ection) <string>]
[-p(aragraph mode toggle)] [-t(abstops spacing) <number>]
[-N(ormalize spacing, changebars)] [-y (zap hyphens toggle)]
[-K (declare that page has no breaks)]
[-d(iff) <file> (diff of old page source to incorporate)]
[-M(essage) <text> (included verbatim at end of Name section)]
[-R(ebus words for TkMan)] [-C (enable Tcl/Tk formatting)]
[-o (no op)] [-O <arg> (no op with arg)]
[-q(uiet--don't report warnings)] [-h(elp)] [-v(ersion)]
[<filename>]</pre>
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修正这个问题，我们只需要在Oracle用户的环境变量下，将$ORACLE_HOME/bin放在PATH变量前就可以了：
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<pre class="brush:sql;">
export PATH=$ORACLE_HOME/bin:$PATH
或export PATH=$ORACLE_HOME/bin:${PATH}:/usr/bin:/bin:/usr/bin/X11:/usr/local/bin</pre>
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重新登录使环境变量生效，现在Oracle能找到正确的rman了：
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<pre class="brush:sql;">
[oracle@oracle10g ~]$ su - oracle
Password:
[oracle@oracle10g ~]$ which rman
~/product/10.2.0/db/bin/rman</pre>
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