From: Tom Felker <tcfelker@...>
Date: 2003-09-01T08:46:33+09:00
Subject: Re: `echo %!(*`

On Mon, 01 Sep 2003 07:51:55 +0900, Daniel Carrera wrote:

> I'm not sure I understand what you're asking about backtick 
> interpolation.  Can you give me a simple example of what you'd like the 
> backtick to do so I understand beter?

oldName = "02_Ship_At_Sea_(Instrumental).ogg"
tags = Hash.new
`vorbiscomment #{oldName}`.each_line do |line|
	key, value = line.split("=", 2)
	tags[key.downcase] = value
end
# ...use tags to formulate proper filename and rename

# Errors:
sh: -c: line 1: syntax error near unexpected token `('
sh: -c: line 1: `vorbiscomment 02_Ship_At_Sea_(Instrumental).ogg'
....

If you use system, you can pass the arguments in an array, and the shell
isn't used, so you can have arguments that the shell would barf on. 

system("echo !@#$%^&") == ""
system("echo", "!@#$%^&") == "!@#$%^&")

I need a backtick method that works the same way.  Having popen work
that way would be nice.  As it is, I think it's only possible with
popen("-"), having the child exec in such a way as to not interpolate
the arguments, and reading from that.

-- 
Tom Felker, <tcfelker@mtco.com>
<http://vlevel.sourceforge.net> - Stop fiddling with the volume knob.

ruby -r complex -e 'c,m,w,h=Complex(-0.75,0.136),50,150,100;puts"P6\n#{w}\n#{h}\
n255";(0...h).each{|j|(0...w).each{|i|n,z=0,Complex(.9*i/w,.9*j/h);while n<=m&&(
z-c).abs<=2;z=z*z+c;n+=1 end;print [10+n*15,0,rand*99].pack("C*")}}'|display
#by Michael Neumann AFAICT