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Re: setup / postinastall script question


On Fri, Jul 09, 2004 at 10:45:39AM -0400, Igor Pechtchanski wrote:
>On Fri, 9 Jul 2004, Corinna Vinschen wrote:
>
>> On Jul  9 09:46, Igor Pechtchanski wrote:
>> > On Fri, 9 Jul 2004, Gerrit P. Haase wrote:
>> > > export PATH=/usr/X11R6/bin:$PATH
>> >
>> > Well, postinstall scripts are usually run with /bin/sh, which means that
>> > you'd have to use the following syntax:
>> >
>> > PATH="/usr/X11R6/bin:$PATH"
>> > export PATH
>>
>> Erm... `export FOO=bar' is perfectly valid bourne shell syntax.  Just try
>> it in ash.
>
>Well, in all the bourne shell manuals I've seen, the export command can
>only take a list of names.  The above is extended syntax that works in
>ash, but is certainly not valid bourne shell syntax (incidentally, IIRC,
>"$(cmd)" is not valid bourne shell syntax either, although it too works in
>ash).
>
>I understand that Cygwin's /bin/sh *is* ash, so if the postinstall script
>is intended to only run on Cygwin, the point is moot.  I guess I was being
>conservative, as well as thinking that if the postinstall script is also
>reused in some other system that supports them (is it Debian's apt?), the
>above might cause a problem.

FWIW, I didn't know that either of the above constructs worked in ash.  I
thought Igor's advice was correct.

Learn something new...


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