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https://issues.apache.org/jira/browse/HADOOP-13079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15271210#comment-15271210
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Andrew Wang commented on HADOOP-13079:
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I'll note that tools like {{cat}} and {{grep}} are for printing the contents of
files, not file metadata like {{ls}}. The default GNU behaviors are simply to
print the non-printable characters. So for the audit log example, since the
audit log is a file, IMO that grep behavior is expected.
{{fsck}} and {{find}} I think are more appropriate analogues, along with things
like {{lsSnapshottableDirs}} and {{listEncryptionZones}}. Likely many others.
If you can help us identify these commands and their expected default
behaviors, we can file more follow-ons for the rest of the FsShell and hdfs
commands.
> 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
> Affects Versions: 2.6.0
> 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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