From: Richard <RichardDummyMailbox58407@...>
Date: 2007-01-26T03:40:11+09:00
Subject: Problem using back-ticks + eval

Hi,

I'm trying to demo how Ruby handles various argument formats.

For example,  I write the statement:
show %@`ruby DisplayArgs.rb Arg1 Arg2`@

and I get the output:
`ruby DisplayArgs.rb Arg1 Arg2`
=>
Arg[1]: "Arg1"
Arg[2]: "Arg2"

I'd like avoid having the back-ticks appear in the output.  I'd like to
achieve this by moving the back-ticks from show invocation to show's
definition. In the following code, comments indicate what I tried, but
it failed.

Any ideas?

Thanks in Advance,
Richard

# ShowCmdLineArgs.rb
def show(stmt)
	print stmt
	puts "\n=> "
	eval("puts " + stmt).inspect                                # Put
back-ticks around "stmt"?
	puts
end

puts "\n========= Examples ========="
show %@`ruby DisplayArgs.rb Arg1 Arg2`@
show %@`ruby DisplayArgs.rb "Embedded "" quotes"`@  # Remove back-ticks
from this?



# DisplayArgs.rb
MAXARGS = 10
puts "No arguments" unless ARGV[0]
(0...MAXARGS).each { |i|
	break unless ARGV[i]
	print "Arg[#{(i+1).to_s}]: "
	puts ARGV[i].inspect
	puts "Quitting without inspecting addition arguments,
if any!" if i == MAXARGS-1
}