On 08/01/2012 03:12 PM, David Klann wrote:
> Hi Jeffrey,
>
> On Wed, 1 Aug 2012 13:02:10 -0600 you coerced some electrons to say:
>
>> David,
>>
>>
>>>> I didn't intend for there to be any bash-isms. The only things I
>>>> know of that I use are $(echo hi) and similar - which I didn't
>>>> think were bash-only. If they are, then I should get rid of them.
>>> I haven't checked lately, but /bin/sh (as in "Bourne") doesn't do
>>> $(). Should probably stick to backticks for command substitution.
>>
>> Depends on your definition of "lately." :-)
>>
>> $() became a requirement for /bin/sh implementations in IEEE
>> 1003.2-1992. That standard codified existing practice, so you'll find
>> $() in every /bin/sh that's under the drinking age.
>>
>> (Me, I stopped using backticks for command substitution in the late
>> 80's.)
>>
>> On even older, non-POSIX Unix-y boxes -- Unix v7 boxes, say -- we'd
>> still have a problem. Are such boxes a target?
>>
>> Boxes that lack /bin/sh, like out-of-the-box Windows machines, are
>> also a problem.
> This is what I get for relying on <Dominant-Search-Engine> for answers
> to such historical questions. Having not used a UNIX(R) system in a
> while, I believed the first search hit for "bourne shell command
> substitution -bash". The link is to http://ibm.co/Nmy3ca which appears
> to be for AIX 5.3. Sigh, it looks like 7.1 is the current release from
> IBM.
>
> Thanks for the additional perspective and reference Jeffrey!
>
Some customers still run AIX 5.3 - but I think it goes out of support
soon (or maybe already has).
--
Alan Robertson <[email protected]> - @OSSAlanR
"Openness is the foundation and preservative of friendship... Let me claim
from you at all times your undisguised opinions." - William Wilberforce
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