<html><head></head><body bgcolor="#FFFFFF"><div><br><br>Sent from my iPhone</div><div><br>On Mar 8, 2012, at 7:18 AM, Mike Fletcher <<a href="mailto:fletch@phydeaux.org">fletch@phydeaux.org</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div><div><br></div><div><br>On Mar 7, 2012, at 10:57 PM, Jim Kinney <<a href="mailto:jim.kinney@gmail.com">jim.kinney@gmail.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div><p>I don't recall the source but I read the backticks are to concidered deprecated. Maybe in the bash 4 release notes?</p></div></blockquote><div>The $() form is the POSIX shell standard now IMSMR. All the kornish shells have supported it for a while now so it wouldn't surprise me to see it get deprecated</div></div></blockquote><div><br></div>The original korn shell had $() since the beginning.<div><br><blockquote type="cite"><div><div><br></div><div>Also to nitpick on the original code:</div><div><br></div><div>* echoing the backticked output of hostname is kind of roundabout. Just run it</div><div><br></div><div>* the separate grep before awk could be replaced with just a single awk</div><div><br></div><div>awk '$0 !~ /swap/ {print $3}'</div><div><br></div><div>Or (for the whitespaceophobes :)</div><div><br></div><div>perl -lane '!/swap/&&print$F[2]'</div><div><br></div><br><blockquote type="cite"><div>
<div class="gmail_quote">On Mar 7, 2012 5:12 PM, "Michael Campbell" <<a href="mailto:michael.campbell@gmail.com">michael.campbell@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
One advantage of $() over `` is that you get matching opposing pairs of parens and nested commands are a bit easier to parse.<div><br></div><div>echo $(foo bar $(baz blah) and then bleh)</div><div><br></div><div>as opposed to </div>
<div><br></div><div>echo `foo bar `baz blah` and then bleh` </div><div><br></div><div><br></div><div>For me another win is that I generally run shells inside emacs buffers so I can make use of the paren-matching feature from within emacs to help out.</div>
<div><br><br><div class="gmail_quote">On Wed, Mar 7, 2012 at 11:25 AM, Benjie <span dir="ltr"><<a href="mailto:benjie.godfrey@gmail.com" target="_blank">benjie.godfrey@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
It looks like you missed placing a single quote after the 'echo `hostname` command. That would prevent awk from interpreting its print command.<br><br><div class="gmail_quote"><div><div></div><div>On Wed, Mar 7, 2012 at 11:07 AM, Brandon Colbert <span dir="ltr"><<a href="mailto:colbert.brandon@gmail.com" target="_blank">colbert.brandon@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div></div><div><div>I am trying figure out what the heck is wrong with awk here.</div><div>
<br></div><div>for i in $(seq 1 1); do ssh 127.0.0.$i 'echo `hostname`; if [ `free -m | grep -i swap | awk '{print $3}'` > 1000 ]; then sudo echo reclaim; else echo hey; fi'; done</div>
<div><br></div><div>The command works, but I get an error about awk: Any suggestions?</div><div><br></div><div><div>deblapatl01</div><div>awk: cmd. line:1: {print</div><div>awk: cmd. line:1: ^ unexpected newline or end of string</div>
<div>hey</div></div><div><br></div>
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