[Mike McLean]
> $ ksh
> $ echo $(echo hi)
> hi
> $ bash
> bash-2.05$ echo $(echo hi)
> hi
> 
> So it appears the only bash and ksh support this syntax.  However,

jmm@bp6:/home/jmm> zsh
bp6% echo $(echo hi)
hi

IMHO, I deprecate shells that aren't bash or zsh anyway - so me
deprecating backticks is fine for my sphere of influence :)

James
-- 
James Manning <[EMAIL PROTECTED]>
GPG Key fingerprint = B913 2FBD 14A9 CE18 B2B7  9C8E A0BF B026 EEBB F6E4

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