kk Blog —— 通用基础


date [-d @int|str] [+%s|"+%F %T"]
netstat -ltunp
sar -n DEV 1

ruby基础

打印一个完整的回溯

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puts caller

Find

http://ruby-doc.org/stdlib-1.9.3/libdoc/find/rdoc/Find.html

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require 'find'
total_size = 0
Find.find(ENV["HOME"]) do |path|
  if FileTest.directory?(path)
    if File.basename(path)[0] == ?.
      Find.prune       # Don't look any further into this directory.
    else
      next
    end
  else
    total_size += FileTest.size(path)
  end
end

Time

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p Time.parse(“2002-03-17”)       #=> Sun Mar 17 00:00:00 +0800[v2] 2002
p Time.now        # =>Mon Oct 20 06:02:10 JST 2003
p Time.now.to_a      # => [10, 2, 6, 20, 10, 2003, 1, 293,false, "JST"]
p Time.now.to_f      # => 1418540681.0154862