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POUsing && in subprocess.Popen for command chaining?
 

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  1. POUsing && in subprocess.Popen for command chaining?
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    <p>I'm using <code>subprocess.Popen</code> with <code>Python</code>, and I haven't come across an elegant solution for joining commands (i.e. foobar<code>&amp;&amp;</code> bizbang) via <code>Popen</code>.</p> <p>I could do this:</p> <pre><code>p1 = subprocess.Popen(["mmls", "WinXP.E01"], stdout=subprocess.PIPE) result = p1.communicate()[0].split("\n") for line in result: script_log.write(line) script_log.write("\n") p1 = subprocess.Popen(["stat", "WinXP.E01"], stdout=subprocess.PIPE) result = p1.communicate()[0].split("\n") for line in result: script_log.write(line) </code></pre> <hr> <p>But that really isn't very aesthetically pleasing (especially if I'm daisy-chaining multiple commands via <code>Popen</code>.</p> <hr> <p><strong>I'd like to replicate this output in as few command blocks as possible.</strong></p> <pre><code>not@work ~/ESI/lab3/images $ mmls WinXP.E01 &amp;&amp; echo -e "\n" &amp;&amp; stat WinXP.E01 DOS Partition Table Offset Sector: 0 Units are in 512-byte sectors Slot Start End Length Description 00: Meta 0000000000 0000000000 0000000001 Primary Table (#0) 01: ----- 0000000000 0000000062 0000000063 Unallocated 02: 00:00 0000000063 0020948759 0020948697 NTFS (0x07) 03: ----- 0020948760 0020971519 0000022760 Unallocated File: `WinXP.E01' Size: 4665518381 Blocks: 9112368 IO Block: 4096 regular file Device: 14h/20d Inode: 4195953 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 1000/ nott) Gid: ( 1000/ nott) Access: 2013-03-16 23:20:41.901326579 -0400 Modify: 2013-03-04 10:05:50.000000000 -0500 Change: 2013-03-13 00:25:33.254684050 -0400 Birth: - </code></pre> <hr> <h2>Any suggestions?</h2> <p>Note: I'd like to avoid typing this into <code>subprocess.Popen</code></p> <pre><code>p1 = subprocess.Popen(["mmls WinXP.E01 &amp;&amp; echo -e '\n' &amp;&amp; stat WinXP.E01"], stdout=subprocess.PIPE) </code></pre>
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    1. COWhen you say "chaining" you just mean running the processes in sequence, right? Not passing the output of one program to the input of the next, like you can do with pipes? If so, it should be easy to come up with a function that takes a sequence of programs to run and returns a string (or list of lines) with the combined output. Just make a loop!
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