From: Jo Ay <wvs_chaos@...>
Date: 2008-04-14T07:29:32+09:00
Subject: Deleting first lines of Array

Hi,
I'm new to Ruby, and so I was trying some stuff I was used to do with
ease in perl. Something like capturing and storing the output of a
commandline app in an array and manipulate that array afterwards.

After searching the net, I finally found the following solution (capture
output, then slice unecessary stuff away). Unfortunately slicing doesn't
work when i'm using open3 to capture the output. Question: what am I
doing wrong?

I attached the working code + the method I want to modify:

Regards
Joey


#############################################################

#!/usr/bin/ruby

class dpkg
    def initialize
        @InstalledPackageList = Array.new
    end

    def collect_inst_packages
        @InstalledPackageList = `/usr/bin/dpkg -l`.split( /\n/ )
        @InstalledPackageList.slice!(0, 5)
    end

    def get_inst_packages(filter = "")
        @InstalledPackageList.grep(/#{filter}/)
    end

    def show_inst_packages(filter = "")
        puts @InstalledPackageList.grep(/#{filter}/)
    end
end

ax = dpkg.new
ax.collect_inst_packages
ax.show_inst_packages(ARGV[0])

#############################################################


    # new method, that I want to use (but I also need to delete
    # the first 5 lines of the dpkg output

    def collect_inst_packages
        require 'open3'
        stdin, @InstalledPackageList, stderr =
Open3.popen3("/usr/bin/dpkg -l")
        # cut away the first 5 lines
    end

#############################################################
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