Re: Bash / Escaping quotes is driving me crazy . .

[Philip Rhoades]

Gordon,


>  Date: Mon, 22 Feb 2016 08:56:54 -0800
>  From: Gordon Messmer <gordon.messmer(a)gmail.com&gt;
>  To: users(a)lists.fedoraproject.org
>  Subject: Re: Bash / Escaping quotes is driving me crazy . .
>  Message-ID: <56CB3DD6.2020909(a)gmail.com&gt;
>  Content-Type: text/plain; charset=utf-8; format=flowed
>  
>  On 02/20/2016 07:18 PM, Philip Rhoades wrote:
> > OK, that all makes sense but there is a further issue - I was trying
> > to keep it simple - this whole line is inside a Ruby "system" command 
> > ie:
> >   system( "ssh .. " )
> > I can't use the second option because I need to use double quotes so
> > that I can use Ruby variables inside the double quotes eg:
>  
>  I think you're still missing some fundamental concepts about nesting
>  quotes.  (I was also mistaken in suggesting that the wildcards needed
>  escaping when the internal double-quotes were escaped, though, so...  
>  We
>  all make mistakes.)
>  
>  In Ruby double-quoted strings, you can get interpolation, and in single
>  quoted strings you don't.  But if you nest single quotes inside a
>  double-quoted strings, Ruby still treats the entire string as double
>  quoted.  It doesn't change the rules when it finds single quotes inside
>  the double-quoted string, because they're merely a part of the
>  double-quoted string.  So your options are:
>  
>  system("ssh localhost \"find /home/... -maxdepth 1 -type f \\\\( -name
>  \\\"*.mp3\\\" -o -name \\\"*.m4a\\\" -o -name
> \\\"*.flac\\\" \\\\)\" ")
>  
>  or:
>  
>  system("ssh localhost 'find /home/... -maxdepth 1 -type f \\( -name
>  \"*.mp3\" -o -name \"*.m4a\" -o -name \"*.flac\" \\)'
> ")
>  
>  Using single quotes means significantly less escaping, and you can 
>  still
>  use interpolation in any part of that string, in Ruby. 

 From another response, what I have actually ended up with is:

  system("ssh localhost 'find /home/... -maxdepth 1 -type f \\( -name
  \*.mp3 -o -name \*.m4a -o -name \*.flac \\)' ")

Thanks!

Phil.
-- 
Philip Rhoades

PO Box 896
Cowra  NSW  2794
Australia
E-mail:  phil(a)pricom.com.au