hadoop stream can not be used to call a shell command

hadoop I use the command hadoop jar contrib/streaming/hadoop-streaming-1.0.0.jar-input input-output output-mapper / bin / cat-file test.sh-reducer ; test.sh
shell script test.sh:
#! / bin / bash
hadoop fs-get input/1.avi ~ / hadoop-1.0.0/tmp/1.avi
error message is:
12/06/01 16:31:25 ERROR streaming.StreamJob: Job not successful. Error: # of failed Reduce Tasks exceeded allowed ; limit. FailedCount: 1. LastFailedTask: task_201206011340_0024_r_000000
12/06/01 16:31:25 INFO streaming.StreamJob: killJob ...
Streaming Job Failed!

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reduce tasks have to hang up, you can see on the web console jobtracker specific fault stack http://jobmaster:port, port is probably 50,070 or 50,030 Port
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finally someone responds.
because in reduce.sh call the hadoop fs-get commands like grep or cat if the change to do what no problem,
reduce the return value back to the task is not 0, hadoop default will try four times, four times, after they reported the entire mission fails,
Is there a shell script called hadoop command experience, how to solve it? Seek advice
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looked wrong as you say, or do not know where is the problem, I hadoop novice, help see what is the problem?
java.lang.RuntimeException: PipeMapRed.waitOutputThreads (): subprocess failed with code 255
at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads (PipeMapRed.java: 311)
at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished (PipeMapRed.java: 545)
at org.apache.hadoop.streaming.PipeMapper.close (PipeMapper.java: 132)
at org.apache.hadoop.mapred.MapRunner.run (MapRunner.java: 57)
at org.apache.hadoop.streaming.PipeMapRunner.run (PipeMapRunner.java: 36)
at org.apache.hadoop.mapred.MapTask.runOldMapper (MapTask.java: 436)
at org.apache.hadoop.mapred.MapTask.run (MapTask.java: 372)
at org.apache.hadoop.mapred.Child $ 4.run (Child.java: 255)
at java.security.AccessController.doPrivileged (Native Method)
at javax.security.auth.Subject.doAs (Subject.java: 396)
at org.apache.hadoop.security.UserGroupInformation.doAs (UserGroupInformation.java: 1083)
at org.apache.hadoop.mapred.Child.main (Child.java: 249)
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after suffering solve some problems, does not recognize the hadoop command, you need to shell script export hadoop environment Variables
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Well then good ah