[jira] [Commented] (HADOOP-8386) hadoop script doesn't work if 'cd' prints to stdout (default behavior in Ubuntu)

["Harsh J (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-8386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461453#comment-13461453 ] 

Harsh J commented on HADOOP-8386:
---------------------------------

Hi Christopher,

Is it cause the default Ubuntu shell is dash (http://manpages.ubuntu.com/manpages/lucid/man1/dash.1.html doesn't prove it though)? We try to make sure the hadoop script runs as a bash script (via a shebang…), and rely on bash's default cd behavior to not cause this. Perhaps some environment specific item on your desktop has overriden the default behavior?

The cd builtin of bash does not print, nor has an option to do so (has -L and -P AFAIK, but neither enforces such a behavior). Must be some odd function wrapper, you can probably detect via "which cd" or "type cd"? What does it say?
                
> hadoop script doesn't work if 'cd' prints to stdout (default behavior in Ubuntu)
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-8386
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8386
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: scripts
>    Affects Versions: 1.0.2
>         Environment: Ubuntu
>            Reporter: Christopher Berner
>         Attachments: hadoop.diff
>
>
> if the 'hadoop' script is run as 'bin/hadoop' on a distro where the 'cd' command prints to stdout, the script will fail due to this line: 'bin=`cd "$bin"; pwd`'
> Workaround: execute from the bin/ directory as './hadoop'
> Fix: change that line to 'bin=`cd "$bin" > /dev/null; pwd`'

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