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copied!<p>If you're in a posix shell environment (I'm really thinking of bash), you can redirect any file descriptor to any other file descriptor, so to redirect, you can just:</p> <pre><code>$ myprogram 2>&5 </code></pre> <p>to redirect stderr to the file represented by fd=5.</p> <p>Edit: on second thought, I like @Konrad Rudolph's answer about redirection better. rdbuf() is a more coherent and portable way to do it.</p> <p>As for logging, well...I start with the Boost library for all things C++ that isn't in the std library. Behold: <a href="http://www.torjo.com/log2/index.html" rel="nofollow noreferrer">Boost Logging v2</a></p> <p><strong>Edit</strong>: Boost Logging is <em>not</em> part of the Boost Libraries; it has been reviewed, but not accepted.</p> <p><strong>Edit</strong>: 2 years later, back in May 2010, Boost did accept a logging library, now called <a href="http://boost-log.sourceforge.net/libs/log/doc/html/index.html" rel="nofollow noreferrer">Boost.Log</a>.</p> <p>Of course, there are alternatives:</p> <ul> <li><a href="http://log4cpp.sourceforge.net/" rel="nofollow noreferrer">Log4Cpp</a> (a log4j-style API for C++)</li> <li><a href="http://logging.apache.org/log4cxx/index.html" rel="nofollow noreferrer">Log4Cxx</a> (Apache-sponsored log4j-style API)</li> <li><a href="http://pantheios.sourceforge.net/" rel="nofollow noreferrer">Pantheios</a> (defunct? last time I tried I couldn't get it to build on a recent compiler)</li> <li><a href="https://github.com/google/glog" rel="nofollow noreferrer">Google's GLog</a> (hat-tip @SuperElectric)</li> </ul> <p>There's also the Windows Event logger.</p> <p>And a couple of articles that may be of use:</p> <ul> <li><a href="http://www.ddj.com/cpp/201804215" rel="nofollow noreferrer">Logging in C++ (Dr. Dobbs)</a></li> <li><a href="http://developers.sun.com/solaris/articles/logging.html" rel="nofollow noreferrer">Logging and Tracing Simplified (Sun)</a></li> </ul>

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