From: 7stud -- <bbxx789_05ss@...>
Date: 2007-10-14T09:58:16+09:00
Subject: Re: backquotes question

Zouplaz wrote:
> Hello, I would like to know why
> cmd = "/bin/df -H /dev/#{partition}"
> used = `#{cmd}`
> 
> works fine but this fails
> used = `"/bin/df -H /dev/#{partition}"`
> 
> with an OS error.
>

Well, first of all they aren't equivalent.  For instance, writing this:

str = "hello"
puts "Hi, #{str} world."

isn't equivalent to writing:

puts "Hi,  "hello" world."

I don't know enough about Unix to know the reason for the system error, 
but this works:

flags = "-l"
puts `ls #{flags}`

But, this does not:

puts `"ls -l"`

The internal quotes messes things up.


>
> BTW, is there an aliase to the backquote ? I mean a kernel method doing
> the same - Just for the syntax, backquotes are not very sexy.
>

puts %x{ls -l}
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