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POHow to get Erlang's release version number from a shell?
 

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  1. POHow to get Erlang's release version number from a shell?
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    <p>Many programs return their version number with a command like:</p> <pre><code>$ program --version program (platform info) v1.2.3 </code></pre> <p>This is useful for scripting the installation or maintenance of the program, and some other controlled automation magic from System Admins &amp; friends.</p> <h2>Problem</h2> <p><em>How to easily get the version number for Erlang (OTP)</em>?</p> <h2>On the net</h2> <p>Here are some unsatisfactory solutions ([1] and other tutorials/Erlang documentation):</p> <p><strong>Emulator</strong></p> <pre><code>$ erl 1&gt; erlang:system_info(otp_release). "R13B03" </code></pre> <p>Hard to script. I have not found a way to have <code>erl</code> execute a single command from a shell prompt.</p> <p><strong>Release file</strong></p> <pre><code>$ cat /usr/lib/erlang/releases/RELEASES [{release,"OTP APN 181 01","R13B03","5.7.4", [{kernel,"2.13.4","/usr/lib/erlang/lib/kernel-2.13.4"}, {stdlib,"1.16.4","/usr/lib/erlang/lib/stdlib-1.16.4"}, {sasl,"2.1.8","/usr/lib/erlang/lib/sasl-2.1.8"}], permanent}]. </code></pre> <p>Parsing paradise (with shell).</p> <p>An alternative could also be checking the install path, but that is not portable (my install path does not include the version, for one).</p> <p>Personal context: I am writing a script to install the same version of RabbitMQ with plugins on several machines. Some plugins have minimal requirements on the OTP version, and it is how this question started.</p> <p>[1] <a href="http://forum.trapexit.org/viewtopic.php?p=42946">http://forum.trapexit.org/viewtopic.php?p=42946</a></p>
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    1. COWhat's so bad about RELEASES? It's trivially parsed by Erlang :-)
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      1. POHow to get Erlang's release version number from a shell?
      1. USJulian Fondren
    2. COOoops, nothing bad with that! I edited the post for the context. I meant parsing the Erlang string with shell tools. My goal is to script SA tasks for an Erlang package.
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    3. COI don't understand Erlang syntax yet; I just want to check whether the installed version supports Riak or not. Starring this and hoping that one day Erlang will provide a simpler way to report its version to administrators of tools that depend on it.
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      1. USIain Samuel McLean Elder
 

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