ruby execute shell command error

Question

Here is the code do.rb:

    #!/usr/bin/ruby

    def open
      fp = File.open("input")
      yield fp
      fp.close
    end

    open do |fp|
      while line = fp.gets
        puts `du #{line} -h`
        # puts `du -h #{line}` # this works fine
      end
    end

And the input file:

    1.rb
    2.rb

If I run ruby do.rb, it just returns a command not found.
And I have to change -h before #{line}.
I don't why. Thanks.

falsetru · Accepted Answer · 2013-11-19 17:31:56Z

2

A string returned by IO#gets contains line separator.

You should remove the line separator using String#chomp:

puts `du #{line.chomp} -h`

answered Nov 19, 2013 at 17:31

falsetru

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