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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13079) Add -q to fs -ls to print non-printable characters
Date Tue, 03 May 2016 16:44:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15269029#comment-15269029
] 

Allen Wittenauer commented on HADOOP-13079:
-------------------------------------------

bq. The most popular UNIX system on Earth, Linux

Linux is not UNIX(tm).  Please stop saying things that aren't true.

bq.  so nobody will be surprised by it.

... except for those that actually use Real UNIX(tm) and not some discount knock off whose
overly zealous followers believe they invented everything.

Keep in mind also that in order to do -q, you need an anti-q.

> Add -q to fs -ls to print non-printable characters
> --------------------------------------------------
>
>                 Key: HADOOP-13079
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13079
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: John Zhuge
>            Assignee: John Zhuge
>              Labels: supportability
>
> 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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