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https://issues.apache.org/jira/browse/HADOOP-7494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084985#comment-13084985
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XieXianshan commented on HADOOP-7494:
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Thanks for your review and guidance,Daryn.
Yes,i think the formatted message is much clearer than the primitive(i.e. For
input string: "something").
And meanwhile,it is also beneficial to keep the style of exception consistent
with the others in preprocessOptions().
{quote}The fact that both 0 & 1 are 0 offset is odd.{quote}
I think so,furthermore,the "\-c\-\+10" is also hard to understand while
"\-c\+\-10" is invalid.
> 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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