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    <p>If you can use CPAN modules (and I'm assuming most people can), look at <a href="https://stackoverflow.com/questions/1909262/pipe-input-into-command-in-perl/1909470#1909470">Ivan's answer</a> on using <a href="http://search.cpan.org/~rjbs/IPC-Run3-0.043/lib/IPC/Run3.pm" rel="nofollow noreferrer">IPC::Run3</a>. It should handle everything you need.</p> <p>If you can't use modules, here's how to do things the plain vanilla way.</p> <p>You can use a pipe to do your input, and it will avoid all those command line quoting issues:</p> <pre><code>open PIPE, "| java -jar java_program.jar"; print PIPE "$string"; close(PIPE); </code></pre> <p>It looks like you actually need the output of the command, though. You <em>could</em> open two pipes with something like <a href="http://search.cpan.org/~nwclark/perl-5.8.3/lib/IPC/Open2.pm" rel="nofollow noreferrer">IPC::Open2</a> (to and from the java process) but you risk putting yourself in deadlock trying to deal with both pipes at the same time.</p> <p>You can avoid that by having java output to a file, then reading from that file:</p> <pre><code>open PIPE, "| java -jar java_program.jar &gt; output.txt"; print PIPE "$string"; close(PIPE); open OUTPUT, "output.txt"; while (my $line = &lt;OUTPUT&gt;) { # do something with $line } close(OUTPUT); </code></pre> <p>The other option is to do things the other way around. Put $string in a temporary file, then use it as input to java:</p> <pre><code>open INPUT, "input.txt"; print INPUT "$string"; close(INPUT); open OUTPUT, "java -jar java_program.jar &lt; input.txt |"; while (my $line = &lt;OUTPUT&gt;) { # do something with the output } close(OUTPUT); </code></pre> <p>Note that this isn't the greatest way to do temporary files; I've just used <code>output.txt</code> and <code>input.txt</code> for simplicity. Look at the <a href="http://search.cpan.org/~jhi/perl-5.8.0/lib/File/Temp.pm" rel="nofollow noreferrer">File::Temp docs</a> for various cleaner ways to create temporary files more cleanly.</p>
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    1. POHow can I pipe input into a Java command from Perl?
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    1. COThat looks great but how do I get the output of the command?
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    2. CO@spudly, you can't with that recommendation. You'd need to use open2(), check perldoc perlipc for "bidirectional communication"
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    3. COMany uses of open2 or open3 on Windows systems are fatally hampered by the fact that you can only `select` against a socket on Win32. If you aren't on Windows or blocking is ok, then open2 or open3 may do the trick for you.
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