delete.rb

puts "Delete instance cache #{@url_instance}"
 FileUtils.cd("#{@base_dir}""#{@cache_dir}")
puts "up_file_instance uid -->#{@uid}"
@fi =  FileUtils.rm_r (@uid), :force => true
puts " fi -->#{@fi}"

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result 

Delete instance cache tati.sandboxbk.net
up_file_instance uid -->tati
 fi -->["tati"]