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