From: Rob Biedenharn <Rob@...>
Date: 2009-12-31T05:53:59+09:00
Subject: Re: awk print $4 in ruby, NEW QUESTION?


On Dec 30, 2009, at 3:10 PM, Derek Smith wrote:

>> Rob Biedenharn wrote:
>> Rob@AgileConsultingLLC.com
>
> Hi again,
>
> Thank you Rob, quite the explanation!
> I did exactly as you said and it seems my loop is not even running:
>
>
> [root@vir/usr/local/vrep/OS_scripts]# ruby filesys_chk.rb /
> entering to_s
> #<FsData:0x8114088 @capacity=nil, @available=nil, @used=nil,
> @filesystem="/", @rawdisk=nil>
>
> class FsData
>    def initialize(filesystem)
>        @rawdisk = @used = @available = @capacity = nil
>        @filesystem = filesystem
>
Take this test...
>        if ARGV.empty?
>            $stderr.puts "An argument of filesystem is required to run
> this script, bye!"
>            exit 1
>        end
...and put it outside the class.

>    end
>
>    def rundf
>        puts "in dfrun method"
>        df = %x(df -m |tail +2)
>        df.each do |ln|
>            df_fields = ln.chomp.split
>            next unless df_fields.last == @filesystem
>
>            @rawdisk    = df_fields[1]
>            @used       = df_fields[2]
>            @available  = df_fields[3]
>            @capacity   = df_fields[4]
>        end
>    end
>
This is begin executed during the parsing of the class definition, not  
when the to_s method is called.  Since you already have the "in to_s  
method" in the right place, I'd just remove the "entering to_s" line  
completely.
>    puts "entering to_s"
>    def to_s
>       puts "in to_s method"
>       str =  "#{@filesystem} :"
>       str << " raw #{@rawdisk}"         if @rawdisk
>       str << " used #{@used}"           if @used
>       str << " available #{@available}" if @available
>       str << " capacity #{@capacity}"   if @capacity
>       if @available <= 4557
>           puts "YESSSSSSSSSSSSSSSSSSSSS!!!!!!!!!!"
>       end
>    end
> end
>
> p FsData.new(ARGV[0])

This creates the FsData object, but never asks it to do the rundf  
method.

The end of your script (i.e., following the class definition) should be:

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 instead of the p (perhaps better):

fs = FsData.new(ARGV[0])
fs.rundf
puts fs

You ought to get output like:

in dfrun method
in to_s method
YESSSSSSSSSSSSSSSSSSSSS!!!!!!!!!!
/ : raw 123456 used 120000 available 3456 capacity 95%

But, of course, I'm just making up the numbers.

-Rob

>
> -- 
> Posted via http://www.ruby-forum.com/.
>

Rob Biedenharn		http://agileconsultingllc.com
Rob@AgileConsultingLLC.com