parameter substitution broken with some commands
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                 Key: PIG-218
                 URL: https://issues.apache.org/jira/browse/PIG-218
             Project: Pig
          Issue Type: Bug
            Reporter: Olga Natkovich
            Assignee: Olga Natkovich


If parameter value is generated via a command, it would fail for some commands. 
Example:

%declare cmd `/usr/local/bin/perl -e 'print "studenttab10k"'`

This command fails because currently the command is executed via call to 
Runtime.exec(cmd). In this case, default tokenizer is used to split the command 
and it does not respect the quotes.

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