[jira] [Commented] (HADOOP-13079) dfs -ls -q prints non-printable characters

["John Zhuge (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-13079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15271521#comment-15271521 ] 

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

Split the jira. This jira will add option {{-q}}; HADOOP-13093 will decide the default behavior on a terminal.

The split gives us more time to debate the proper default behavior, and weigh trade-offs. It may also enable different target versions.

> dfs -ls -q prints 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
>
> 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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