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Add some info about the pipelines and redirection.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36030 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -323,6 +323,24 @@ location of these external programs is configured by the llvm-test
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any process in the pipeline fails, the entire line (and test case) fails too.
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</p>
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<p>As with a Unix shell, the RUN: lines permit pipelines and I/O redirection
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to be used. However, the usage is slightly different than for Bash. To check
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what's legal, see the documentation for the
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<a href="http://www.tcl.tk/man/tcl8.5/TclCmd/exec.htm#M2">Tcl exec</a>
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command and the
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<a href="http://www.tcl.tk/man/tcl8.5/tutorial/Tcl26.html">tutorial</a>.
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The major differences are:</p>
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<ul>
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<li>You can't do <tt>2>&1</tt>. That will cause Tcl to write to a
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file named <tt>&1</tt>. Usually this is done to get stderr to go through
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a pipe. You can do that in tcl with <tt>|&</tt> so replace this idiom:
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<tt>... 2>&1 | grep</tt> with <tt>... |& grep</tt></li>
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<li>You can only redirect to a file, not to another descriptor and not from
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a here document.</li>
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<li>tcl supports redirecting to open files with the @ syntax but you
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shouldn't use that here.</li>
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</ul>
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<p> Below is an example of legal RUN lines in a <tt>.ll</tt> file:</p>
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<pre>
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; RUN: llvm-as < %s | llvm-dis > %t1
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