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https://issues.apache.org/jira/browse/HADOOP-7494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13086282#comment-13086282
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XieXianshan commented on HADOOP-7494:
-------------------------------------
Thanks Daryn.
Yes,the code seems not working well for these scenarios.
* "tail \-c \+\-10 file"
Long.parseLong("-10") will be ok while "+" removed by the code "arg =
arg.substr(arg,1)".The fact is that the number of bytes is invalid for tail -c.
* "tail \-c \-\+10 file"
Long.parseLong("-+10") will throw an exception.But it should be a valid
number of bytes.
Therefore,i added some code to process them.
> 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: XieXianshan
> Priority: Trivial
> Fix For: 0.23.0
>
> Attachments: HADOOP-7494-v0.2.patch, HADOOP-7494-v0.3.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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