[ale] Stupid Bash Question

[Geoffrey Myers]

Sent from my iPhone

On Mar 8, 2012, at 7:18 AM, Mike Fletcher <fletch at phydeaux.org> wrote:

> 
> 
> On Mar 7, 2012, at 10:57 PM, Jim Kinney <jim.kinney at gmail.com> wrote:
> 
>> I don't recall the source but I read the backticks are to concidered deprecated.  Maybe in the bash 4 release notes?
>> 
> 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

The original korn shell had $() since the beginning.

> 
> Also to nitpick on the original code:
> 
> * echoing the backticked output of hostname is kind of roundabout. Just run it
> 
> * the separate grep before awk could be replaced with just a single awk
> 
> awk '$0 !~ /swap/ {print $3}'
> 
> Or (for the whitespaceophobes :)
> 
> perl -lane '!/swap/&&print$F[2]'
> 
> 
>> On Mar 7, 2012 5:12 PM, "Michael Campbell" <michael.campbell at gmail.com> wrote:
>> One advantage of $() over `` is that you get matching opposing pairs of parens and nested commands are a bit easier to  parse.
>> 
>> echo $(foo bar $(baz blah) and then bleh)
>> 
>> as opposed to 
>> 
>> echo `foo bar `baz blah` and then bleh`    
>> 
>> 
>> 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.
>> 
>> 
>> On Wed, Mar 7, 2012 at 11:25 AM, Benjie <benjie.godfrey at gmail.com> wrote:
>> It looks like you missed placing a single quote after the 'echo `hostname` command.  That would prevent awk from interpreting its print command.
>> 
>> On Wed, Mar 7, 2012 at 11:07 AM, Brandon Colbert <colbert.brandon at gmail.com> wrote:
>> I am trying figure out what the heck is wrong with awk here.
>> 
>> 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
>> 
>> The command works, but I get an error about awk: Any suggestions?
>> 
>> deblapatl01
>> awk: cmd. line:1: {print
>> awk: cmd. line:1:       ^ unexpected newline or end of string
>> hey
>> 
>> 
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