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Date: Tue, 7 Jun 2016 01:52:21 +0000 (UTC)
From: "John Zhuge (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.12964321.1462202552000.8642.1465264341034@Atlassian.JIRA>
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Subject: [jira] [Commented] (HADOOP-13079) Add dfs -ls -q to print ? instead
 of non-printable characters
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archived-at: Tue, 07 Jun 2016 01:52:23 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-13079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15317650#comment-15317650 ] 

John Zhuge commented on HADOOP-13079:
-------------------------------------

Thanks [~andrew.wang] for the encouragement!

I can see your point about the question mark which is only what is used to hide the non-printable characters. How about renaming it to "hideNonPrintable" which is consistent to help message and the jira title?

> Add dfs -ls -q to print ? instead of non-printable characters
> -------------------------------------------------------------
>
>                 Key: HADOOP-13079
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13079
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: John Zhuge
>            Assignee: John Zhuge
>         Attachments: HADOOP-13079.001.patch, HADOOP-13079.002.patch, HADOOP-13079.003.patch
>
>
> Add option {{-q}} to "hdfs dfs -ls" to print non-printable characters as "?". Non-printable characters are defined by [isprint(3)|http://linux.die.net/man/3/isprint] according to the current locale.
> Default to {{-q}} behavior on terminal; otherwise, print raw characters. See the difference in these 2 command lines:
> * {{hadoop fs -ls /dir}}
> * {{hadoop fs -ls /dir | od -c}}
> In C, {{isatty(STDOUT_FILENO)}} is used to find out whether the output is a terminal. Since Java doesn't have {{isatty}}, I will use JNI to call C {{isatty()}} because the closest test {{System.console() == null}} does not work in some cases.


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