From: Chen Ge <chenge2k@...>
Date: 2010-04-12T09:42:45+09:00
Subject: Re: Using popen & grep

Dan King wrote:
> I'm relatively new to ruby and to practice I've put together the code
> below - it's supposed take two arguments then apply it to a grep command
> and display the output. Currently, nothing is outputted to the console.
> Anyone see what I'm doing wrong, thanks.
> 
>   1 #!/usr/bin/ruby
>   2
>   3 results = IO.popen("grep -i #{ARGV[0]} #{ARGV[1]}", "r")
>   4 while output = results.gets
>   5     puts output
>   6 end
>   7 results.close

cmd="grep -i #{ARGV[0]} #{ARGV[1]}"
puts cmd

results = IO.popen(cmd, "r")
while output = results.gets
     puts output
end
results.close

you should chech ARGV is correct. you can run cmd on console to see 
result,cheers!
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