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!!!Upgrade GNU Parallel Using Macports

You are all using [GNU Parallel|http://www.gnu.org/software/parallel/], right?  It's an awesome replacement for xargs, bash loops, all sorts of low-level unix command line stuff.  Parallel provides a clean way to execute many jobs in parallel on the command line to take advantage of our modern multicore cpus inside command pipelines.

One thing I particularly love about parallel is it provides a much cleaner and simpler quoting facility than <code>find -exec</code> or <code>xargs</code>.

You can install parallel on a mac via [Macports|http://www.macports.org/], but that is currently at version 20100922.  There's been a lot of development in parallel in the last few months so you probably want to get the latest version.

Sidebar: yes I know that [homebrew|http://mxcl.github.com/homebrew/] is supposed to be better than macports, but I haven't tried it yet.

Anyway, [@kogent|http://www.twitter.com/kogent] just [posted an updated portfile for gnu parallel|https://trac.macports.org/ticket/29322].  You can use this to build and install the latest parallel (20110422) on your mac.  Here's what I just did, following this [local macports repo guide|http://guide.macports.org/chunked/development.local-repositories.html].

* download the [new portfile|https://trac.macports.org/raw-attachment/ticket/29322/Portfile].
* look in that file, see that it's category <code>sysutils</code>.
* create my local port directory tree with <code>mkdir -p ~~/ports/sysutils/parallel</code>
* copy the Portfile to <code>~~/ports/sysutils/parallel</code>
* build the port index via <code>cd ~~/ports && portindex</code>
* tell the system to look at my private portdir
   * edit <code>/opt/etc/macports/sources.conf</code> (as root)
   * add the line <code>file:///Users/philiph/ports</code> (_before_ the existing url line)

That's it.  Now if you run <code>port search parallel</code> you should see the 04222011 version listed _before_ the old version.  Run <code>port install parallel</code> and the new version will be installed.

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