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  1. PO
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    <p>Your invocation of <a href="http://linux.die.net/man/1/nc" rel="nofollow"><code>nc</code></a> is bad, what will happen if I invoke this as you in command line:</p> <pre><code># Server window: [vyktor@grepfruit ~]$ nc -l 5050 # Client Window [vyktor@grepfruit ~]$ nc localhost 5050 [vyktor@grepfruit ~]$ echo $? 1 </code></pre> <p>Which mean (<code>1</code> in <code>$?</code>) failure.</p> <p>Once you use <code>-p</code>:</p> <pre class="lang-none prettyprint-override"><code>-p, --local-port=NUM local port number </code></pre> <p>NC starts listening, so:</p> <pre><code># Server window [vyktor@grepfruit ~]$ nc -l -p 5050 # Keeps handing # Client window [vyktor@grepfruit ~]$ echo Hi | nc localhost 5050 # Keeps hanging </code></pre> <p>Once you add <code>-c</code> to client invocation:</p> <pre class="lang-none prettyprint-override"><code>-c, --close close connection on EOF from stdin </code></pre> <p>You'll end up with this:</p> <pre><code># Client window [vyktor@grepfruit ~]$ echo Hi | nc localhost 5050 -c [vyktor@grepfruit ~]$ # Server window [vyktor@grepfruit ~]$ nc -l -p 5050 Hi [vyktor@grepfruit ~]$ </code></pre> <p>So you need this python piece of code:</p> <pre class="lang-python prettyprint-override"><code>#!/usr/bin/env python import subprocess lookup_server = subprocess.Popen("nc -l -p 5050", shell=True) lookup_client = subprocess.Popen("nc -c localhost 5050", shell=True, stdin=subprocess.PIPE) lookup_client.stdin.write("magic\n") lookup_client.stdin.close() # This lookup_client.send_signal(subprocess.signal.SIGINT) # or this kill lookup_server.wait() print "Lookup server terminated properly" </code></pre>
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    1. POPython subprocesses don't output properly?
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    1. COThe commands are correct for BSD netcat, but not GNU netcat. So I assume he's on a Mac or *BSD system.
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    2. CO@abarnert wouldn't it work if he was on BSD netcat? This looks like most probable explanation to me... Maybe OP can add some details.
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    3. CONo, it doesn't work, because he doesn't have the `close()`, which is the only reason yours works with GNU netcat…
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