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vartarget= $;varNumber=0; Do{ number=window.prompt ("Enter a number", number);if(number==NULL|| number==target) Break;if(number>target) {Alert ( number+"too Big");Continue;}Else if(number!=target) {Alert ( number+"too small");Continue;}} while(true)if(number==NULL) Alert ("No, guess! The answer is:"+target)ElseAlert ("Guess right! The answer is:"+target)</script></body>
47, Iostat command: Through the Iostat convenient to view the CPU, network card, TTY device, disk, CD-ROM and other equipment activities, load information.

48. The watch command outputs the output of the command to a standard output device and is used for periodic execution of commands/timed execution commands

49. At command time scheduled task
Executes a specified task at a specified time, only once, and requires the ATD process to be turned on
Ps-ef | grep ATD View, open with/etc/init.d/atd start or restart;

50. Crontab command
The Linux system is controlled by the cron (Crond) system service. The Linux system has a lot of planned work on it, so this system service is started by default

51, lsof command: List the current system Open File tool

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