Why does calling a Bash command from Ruby throw an error?

Question

I'm attempting to execute the following bash command on some images using Ruby:

class Pingcrush
  def initialize
    Dir.foreach('drawable') do |item|
      next if item == '.' or item == '..'
      # do work on real items
      if item.end_with?(".png") then
        %x["wine pngcrush.exe -brute drawable/#{item} new/#{item}"]
      end
    end
  end
end
Pingcrush.new

The directory I am in is the parent to both drawable and new, however, when when I attempt to run the script I always get the same error:

sh: wine pngcrush.exe -brute drawable/feed_cl.png new/feed_cl.png: not found

Why is this happening? I tried switching around the path I'm calling in Ruby and can't seem to make this work.

Ura · Accepted Answer · 2011-06-02 14:33:48Z

5

Its executing your shell but can't find wine. Try setting the full path to where wine is installed.

which wine

answered Jun 2, 2011 at 14:33

Ura

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1 Comment

Mr. Black Over a year ago

@Aidanc, you should give the full path for wine and your exe file (pngcrush.exe).

Jonathan · Accepted Answer · 2011-06-02 15:00:37Z

1

Don't put quotes around your command.

answered Jun 2, 2011 at 15:00

Jonathan

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Comments

Andrew Grimm · Accepted Answer · 2011-06-02 23:32:22Z

1

You have checked that wine pngcrush.exe -brute drawable/feed_cl.png new/feed_cl.png works when you type it from the command line, haven't you?

answered Jun 2, 2011 at 23:32

Andrew Grimm

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