Shell test or quoting mechanism breaks on parens

[Dung_Nguyen at Dell.com]

Dell - Internal Use - Confidential
Hello,
I used to use busybox 1.00 and this command line returns 0 or at least the output is the same as RHEL 5.3 shell:

   # [ '(' = '(' ] ; rc=$? ; echo $rc ; [ $rc -ne 0 ] && echo EVIL SH TEST/QUOTE
   0

However, after I upgraded to busybox 1.20.2 and I see different output:

   # [ '(' = '(' ] ; rc=$? ; echo $rc ; [ $rc -ne 0 ] && echo EVIL SH TEST/QUOTE
   sh: closing paren expected
   2
   EVIL SH TEST/QUOTE

Does anyone know why the output is different with busybox 1.00 or is this a security issue from cmd line ?

Thanks,
Dung Nguyen
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