安装pig之后，我不能再从命令行调用hadoop了。
前任：

C:\Users\Andrew\Documents\Hadoop\Karung>hadoop version
'hadoop' is not recognized as an internal or external command,
operable program or batch file.

下面是我的 Path :

c:\Program Files (x86)\Intel\iCLS Client\;c:\Program Files\Intel\iCLS Client\;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Windows Live\Shared;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;C:\Python27;C:\Python27\Scripts;C:\Python27\Lib\site-packages;C:\Program Files (x86)\Git\cmd;C:\Program Files (x86)\Git\bin\;C:\Users\Andrew\Documents\bat_files;C:\Users\Andrew\Documents\Hadoop\hadoop-0.23.8\bin;C:\Users\Andrew\Documents\Pig\pig-0.11.1\bin

我还有hadoop、pig和java安装变量，如下所示：
HADOOP_INSTALL C:\Users\Andrew\Documents\Hadoop\hadoop-0.23.8 PIG_INSTALL C:\Users\Andrew\Documents\Pig\pig-0.11.1 JAVA_HOME C:\Program Files\Java\jdk1.7.0_21 一切似乎都设置正确。当我从它们的目录运行命令时，它们都会执行。为什么命令行不能识别hadoop？谢谢！