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sideshowcoder/only_once.rb

Created July 26, 2013 08:29
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run only once script in ruby
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only_once.rb
require 'fileutils'
exit if FileTest.exist?('lock.file')
# create a lock
FileUtils.touch('lock.file')
# do some work
sleep 30
# free the lock
FileUtils.rm('lock.file')
exit
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