cd /d D:\dig
检测文件的完整性
D:\dig>sha1sum *
489a8ca7c7851088ade58c404ddde1a926559003  cygwin1.dll
57487baeaa0eb2848557b7ca54ed9183eafc73fa  dig.exe
97dbd755d67a5829c138a4708be7a4f26ed0894c  host.exe
d22e4b8956e1831ff0f9d07620ec19bf171f0c29  libbind9.dll
81588f0be7d3c6b320edc314532d9f2d0a105594  libdns.dll
e0bd7187bbc01003abfe7472e64b68cd1bdb6bab  libeay32.dll
f445362e728a902796ec6871a79c6307054974e4  libisc.dll
b3255c0e4808a703f95c217a91ffcd6940e680c9  libisccfg.dll
dfbde4f9e25fd49a0846e97fd813d6876dc94067  liblwres.dll
61b8f573db448ae6351ae3475c2e7c482d81533c  msvcr70.dll
da39a3ee5e6b4b0d3255bfef95601890afd80709  resolv.conf
4a578ecd09a2d0c8431bdd8cf3d5c5f3ddcddfc9  sha1sum.exe
9d9ec0e2cf59e14d9db618d10b55b881bb7d195b  whois.exe
我的电脑，右键属性，高级，系统变量
修改
变量名：PATH
变量值：c:\windows\system32;d:\dig
#system32后面的分号不能有空格！
测试:
C:\Documents and Settings\Administrator>dig google.com
; <<>> DiG 9.3.2 <<>> google.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 797
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;google.com.                    IN      A
;; ANSWER SECTION:
google.com.             300     IN      A       66.249.89.99
google.com.             300     IN      A       66.249.89.104
;; Query time: 109 msec
;; SERVER: 8.8.4.4#53(8.8.4.4)
;; WHEN: Thu Sep 16 23:31:02 2010
;; MSG SIZE  rcvd: 60