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From "Pundurs, Mark" <mark.pund...@navteq.com>
Subject RE: -test -d return values in 0.20.2?
Date Fri, 13 Jan 2012 17:22:30 GMT
So I was retrieving stdout rather than the return value. :( I've got this working now. Thanks,
Harsh!

> From: Harsh J [mailto:harsh@cloudera.com]
> Sent: Friday, January 13, 2012 10:37 AM
>
> Hello Mark,
>
> The command is to be used by testing the return code observed:
>
> Option | Meaning | Success code | Failure code
>
> -d | directory test | 0 | 1
> -e | exists test | 0 | 1
> -z | empty file test | 0 | 1
>
> For non existent files or other errors, 255 is returned.
>
> In the shell, you can use $? to check return code of a command, and
> then run conditions on it as you'd like.
>
> Here's a sample way to use this (I have a dir 'examples' and a file
> 'README.txt'):
>
> ➜  ~HADOOP_HOME  hadoop dfs -test -d examples
> ➜  ~HADOOP_HOME  echo $?
> 0
> ➜  ~HADOOP_HOME  hadoop dfs -test -d README.txt
> ➜  ~HADOOP_HOME  echo $?
> 1
>
> On 13-Jan-2012, at 9:19 PM, Pundurs, Mark wrote:
>
> > When using v0.20.2, the script command
> >
> > echo "test result is >$( bin/hadoop dfs -test -d $FILEPATH )<"
> >
> > gives the following output whether FILEPATH is a directory or a file:
> >
> > test result is ><
> >
> > Is this a known issue in 0.20.2? Or am I missing the point of -test -
> d? Or = what?
> >
> > Mark Pundurs
> > Data Analyst - Traffic
> > Nokia Location & Commerce


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