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SICP, 1.8, page17

#!/usr/bin/env racket
#lang racket

(define (root-iter guess x)
    (if (good guess x)
    	guess
	(root-iter (improved guess x) x)))

(define (good y x)
    (< (abs (- (* y y y) x)) 0.001))

(define (improved y x)
    (/ (+ (/ x y y) (+ y y)) 3))

(define (root x)
    (root-iter 1 x))

(root 30000.001)

activate application "SystemUIServer"
tell application "System Events"
	tell process "SystemUIServer"
		
		set x to item 3 of menu bar items of menu bar 1
		tell x
			click
			click menu item "Connect Cisco VPN" of front menu
			delay 3
			keystroke token
			keystroke return
		end tell
	end tell
end tell

set tokens to ""
tell application "System Events" to tell process "SofToken II"
	tell application "SofToken II" to activate
	delay 1
	keystroke "***"
	delay 1
	repeat 10 times
		keystroke return
		set token to the clipboard
		set tokens to tokens & "\r" & token
		delay 1
	end repeat
end tell

tokens

• 刷新DNS sudo dscacheutil -flushcache

• 在终端中打开当前文件夹 open .

Set VSOCK_CONFED = "no" in /etc/vmware/config

via http://resalxh.wordpress.com/2010/09/09/vmware-player-3-1-1-on-ubuntu-10-10-maverick-meerkat/

from python cookbook. How to check a variable is String or not.

如果它走路像鸭子，叫声也像鸭子，那么对于我们而言，就可以认为它是鸭子了。

3 functions are borrowed from Here. 

as subject.

• 查看硬件信息：sudo lshw  #ls hardware
• 查看CPU位数32/64：getconf LONG_BIT #longest integer bit.
• 快速建立文件服务器并显示自已的IP：ifconfig |grep  -oP "(?<=inet addr:)[0-9.]+" |grep -v 127.0.0.1 | sed "s/\$/:8000/"  && python -m SimpleHTTPServer
• resize image: convert source -resize '100x200' dest
   

simply wrap it with threading.