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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1475) Want a -d flag in hadoop dfs -ls : Do not expand directories
Date Fri, 22 Oct 2010 22:30:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924062#action_12924062

Aaron T. Myers commented on HDFS-1475:


This would be extremely useful. For that matter, this would allow one to see the permissions,
etc of the root directory, which presently I know of no way to view, aside from the OIV. :)

> Want a -d flag in hadoop dfs -ls : Do not expand directories
> ------------------------------------------------------------
>                 Key: HDFS-1475
>                 URL: https://issues.apache.org/jira/browse/HDFS-1475
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>    Affects Versions: 0.20.1
>         Environment: any
>            Reporter: Greg Connor
>            Priority: Minor
> I would really love it if dfs -ls had a -d flag, like unix ls -d, which would list the
directories matching the name or pattern but *not* their contents.
> Current behavior is to expand every matching dir and list its contents, which is awkward
if I just want to see the matching dirs themselves (and their permissions).  Worse, if a directory
exists but is empty, -ls simply returns no output at all, which is unhelpful.  
> So far we have used some ugly workarounds to this in various scripts, such as
>   -ls /path/to |grep dir   # wasteful, and problematic if "dir" is a substring of the
>   -stat /path/to/dir "Exists"  # stat has no way to get back the full path, sadly
>   -count /path/to/dir  # works but is probably overkill.
> Really there is no reliable replacement for ls -d -- the above hacks will work but only
for certain isolated contexts.  (I'm not a java programmer, or else I would probably submit
a patch for this, or make my own jar file to do this since I need it a lot.)

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