From: Albert Schlef <albertschlef@...>
Date: 2009-12-31T10:31:18+09:00
Subject: Re: awk print $4 in ruby, NEW QUESTION?

Derek Smith wrote:
>         df = %x(df -m |tail +2)

On my system (Linux) "tail +2" doesn't work. You have to write it "tail 
-n +2". If on your system this doesn't work, it means that this function 
isn't portable and you should strip the header line via Ruby instead.


>
> if ARGV.empty?
>   $stderr.puts "An argument of filesystem is required
>            to run this script, bye!"
>   exit 1
> end
>
> p FsData.new(ARGV[0]).rundf

Or do:

p FsData.new(ARGV[0] || (raise "Argument not suplied")).rundf



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