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> -----Original Message-----
> From: list-bounce / example.com 
> [mailto:list-bounce / example.com] On Behalf Of Abhijeet Dharmapurikar
> Sent: Thursday, August 16, 2007 12:51 PM
> To: ruby-talk ML
> Subject: file grep
> 
> I have a file that has a list of filenames- filenames.txt I 
> have another file that has list of all the files in the 
> system with their complete filepaths - allfilespath.txt
> 
> I want to print the fullpaths of all the files listed in 
> filenames.txt In shell scripting I would have done somethign like this
> 
> for name in filenames.txt
> do
>   grep $name allfilespath.txt
>   if [ $? == 1 ]
>   then
>     echo $output_from_grep
>   fi
> done
> 
> 
> How do I do this in ruby  ? If possible (again if possible) 
> explain what the code does. If not I will google and update 
> what each line does.
> --
> Posted via http://www.ruby-forum.com/.
> 


Disclaimer: Reading the complete files in to arrays like this may cost a
bunch of memory depending on file size

# read in an array that contains one element per line from the list of
filesnames
filenames = File.new("filenames.txt").readlines
# read in an array that contains one element per line from the list of full
filepaths
paths = File.new("allfilespath.txt").readlines
# cycle through all filenames
filenames.each do |filename|
  # File.basename with one argument returns the last element of the
filepath, so the filename in a path
  # the find_all method from the Enumerable mixin passes each element of the
collection to the block, and returns an array of those where the block
evaluates to true
  paths.find_all{|path| File.basename == filename}.each do |match|
    # cycle through the matches, and print them
    puts "#{filename} matches #{match}"
  end
end


HTH,

Felix

  

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