On Thu, 14 Mar 2013 11:15:20 -0500, Joel C. Ewing wrote:
>
>If "date" under z/OZ UNIX supports the same parameters, then
>date +%Y%m%d --date="1 day ago"
>which today on Fedora returns "20130313"  may be the form you need.
>  
I believe that any option introduced by two hyphens is a GNUism; not POSIX;
not available on z/OS.

-- gil

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