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https://issues.apache.org/jira/browse/PIG-5362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16645619#comment-16645619
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Rohini Palaniswamy commented on PIG-5362:
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{{echo $\\stuff}} becomes {{echo $stuff,}} but {{echo $\\\\stuff}} becomes
{{$\\stuff}}. Does not sound right to me
> Parameter substitution of shell cmd results doesn't handle backslash
> ---------------------------------------------------------------------
>
> Key: PIG-5362
> URL: https://issues.apache.org/jira/browse/PIG-5362
> Project: Pig
> Issue Type: Bug
> Components: parser
> Reporter: Will Lauer
> Priority: Minor
> Attachments: pig.patch, pig2.patch
>
>
> It looks like there is a bug in how parameter substitution is handled in
> PreprocessorContext.java that causes parameter values that contain
> backslashed to not be processed correctly, resulting in the backslashes being
> lost. For example, if you had the following:
> {code:java}
> %DECLARE A `echo \$foo\\bar`
> B = LOAD $A
> {code}
> You would expect the echo command to produce the output {{$foo\bar}} but the
> actual value that gets substituted is {{\$foobar}}. This is happening because
> the {{substitute}} method in PreprocessorContext.java uses a regular
> expression replacement instead of a basic string substitution and $ and \ are
> special characters. The code attempts to escape $, but does not escape
> backslash.
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