John Zhuge created HADOOP-13079:
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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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