常用Dos 命令

telnet ip 端口号：检查端口是否打开

netstat -an：查看已打开的所有端口

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获取日期和时间

C:\>echo %date%

Wed 11/13/2013

C:\>echo %time%
12:32:37.89

C:\>echo %date:~0,3%
Wed

%date%是一个参数，后面带的~0,3表示取值范围

~表示从环境变量的内容的左边开始，~m,n： m表示从第m个字符开始，n表示取n个字符

~0,3意思是从头开始取3个字符，所以为Wed

C:\>echo %date:~-4%

2013 

~-4: 负数代表倒数,也就取最后4个字符

C:\>echo %date:~-7,-5%
13

~-7,-5: 取最后7个字符，并且不显示其中最后5个

C:\>echo %date:~-7,5%
13/20

~-7,5: 取最后7个字符，并且不显示其中前5个

C:\>echo %date:~-4%-%date:~-7,-5%-%date:~-10,-8% %time:~0,2%_%time:~3,2%_%time:~6,2%

2013-13-11 12_29_44

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 Tzutil: Displays the Windows Time Zone Utility. For more details, see http://technet.microsoft.com/en-us/library/hh875624.aspx

  tzutil [/?] [/g] [/s <TimeZoneID>[_dstoff]] [/l]

Parameter	Description
/?	Displays Help at the command prompt.
/g	Displays the current time zone ID.
/s <TimeZoneID>[_dstoff]	Sets the current time zone using the specified time zone ID. The _dstoff suffix disables Daylight Saving Time adjustments for the time zone (where applicable).
/l	Lists all valid time zone IDs and display names. The output will be: <display name> <time zone ID>