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Question about testing with variable operators

From: Steven W. Orr
Subject: Question about testing with variable operators
Date: Fri, 10 Jun 2011 11:44:42 -0400
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv: Gecko/20110414 Thunderbird/3.1.10

I am using arithmetic tests where the test operator is passed in as an arg and it works just fine.

    (( $1 $2 $3 ))

foo 5 '>' 7

But I figured that if this works for arithmetic, it should also work with the test operator. It seems to not work:

514 > bar()
> {
>     [[ $1 $2 ]]
bash: conditional binary operator expected
bash: syntax error near `$2'

As a work around, I can use eval or the builtin test, but my question is this: Is this a bug or is there a reason that it should work for arithmetic but not for the test [[ operator?

GNU bash, version 4.0.35(1)-release (x86_64-redhat-linux-gnu)


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