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Date: Mon, 2 May 2016 15:23:12 +0000 (UTC)
From: "John Zhuge (JIRA)" <jira@apache.org>
To: common-dev@hadoop.apache.org
Message-ID: <JIRA.12964321.1462202552000.86261.1462202592850@Atlassian.JIRA>
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Subject: [jira] [Created] (HADOOP-13079) Add -q to fs -ls to print
 non-printable characters
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archived-at: Mon, 02 May 2016 15:23:20 -0000

John Zhuge created HADOOP-13079:
-----------------------------------

             Summary: 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


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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