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https://issues.apache.org/jira/browse/HADOOP-13079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15272881#comment-15272881
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Allen Wittenauer commented on HADOOP-13079:
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bq. even cause your xterm to run arbitrary code by abusing escape sequences.
Does it matter what command was used to generate the sequence? No, of course
not.... which makes it a hole in xterm, not ls.
> 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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