在window eclipse上测试hadoop 程序时，出现不能执行chmod问题。 

需要安装cygwin程序：点击下载x64 cygwin

具体安装步骤，网上很多文章有介绍了。 

错误如下：

15/04/19 14:41:29 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
15/04/19 14:41:29 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.
Exception in thread "main" java.io.IOException: Cannot run program "chmod": CreateProcess error=2, ?????????
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1041)
	at org.apache.hadoop.util.Shell.runCommand(Shell.java:149)
	at org.apache.hadoop.util.Shell.run(Shell.java:134)
	at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:286)
	at org.apache.hadoop.util.Shell.execCommand(Shell.java:354)
	at org.apache.hadoop.util.Shell.execCommand(Shell.java:337)
	at org.apache.hadoop.fs.RawLocalFileSystem.execCommand(RawLocalFileSystem.java:481)
	at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:473)
	at org.apache.hadoop.fs.FilterFileSystem.setPermission(FilterFileSystem.java:280)
	at org.apache.hadoop.fs.FileSystem.mkdirs(FileSystem.java:266)
	at org.apache.hadoop.mapred.JobClient.configureCommandLineOptions(JobClient.java:573)
	at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:761)
	at org.apache.hadoop.mapreduce.Job.submit(Job.java:432)
	at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:447)
	at com.billstudy.hdfs.WordCount.main(WordCount.java:51)
Caused by: java.io.IOException: CreateProcess error=2, ?????????
	at java.lang.ProcessImpl.create(Native Method)
	at java.lang.ProcessImpl.(ProcessImpl.java:376)
	at java.lang.ProcessImpl.start(ProcessImpl.java:136)
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1022)
	... 14 more

解决问题步骤如下：

1.安装cygwin

2.将按照目录 cygwin安装目录/bin 设置到机器环境变量里面 ， 和Java的环境配置类似。