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https://issues.apache.org/jira/browse/HADOOP-7494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14600604#comment-14600604
 ] 

Hadoop QA commented on HADOOP-7494:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  16m 17s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to 
include 1 new or modified test files. |
| {color:green}+1{color} | javac |   7m 29s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |   9m 42s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 21s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   1m  4s | There were no new checkstyle 
issues. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 35s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 32s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   1m 50s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | common tests |  22m  4s | Tests passed in 
hadoop-common. |
| | |  60m 58s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12741751/HADOOP-7494.004.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / a815cc1 |
| hadoop-common test log | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/7037/artifact/patchprocess/testrun_hadoop-common.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/7037/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf906.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP 
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/7037/console |


This message was automatically generated.

> Add -c option for FSshell -tail
> -------------------------------
>
>                 Key: HADOOP-7494
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7494
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 0.23.0
>            Reporter: XieXianshan
>            Assignee: Masatake Iwasaki
>            Priority: Trivial
>         Attachments: HADOOP-7494-v0.2.patch, HADOOP-7494-v0.3.patch, 
> HADOOP-7494.004.patch, HADOOP-7494.005.patch, HADOOP-7494.patch
>
>
> Add the "-c" option for FSshell -tail to allow users to specify the output 
> bytes(currently,it's -1024 by default).
> For instance:
> $ hdfs dfs -tail -c -10 /user/hadoop/xiexs
> or
> $ hdfs dfs -tail -c+10 /user/hadoop/xiexs



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