RE: bash date math

[Ward William E DLDN <wardwe navseadn navy mil>]

> -----Original Message-----
> From: Hal Burgiss [mailto:hal foobox net]
> Sent: Thursday, July 31, 2003 10:50 AM
> To: redhat
> Subject: Re: bash date math
> 
> 
> On Thu, Jul 31, 2003 at 09:45:55AM -0500, rick henderson wrote:
> > In a bash script, I need to know the previous day.
> > 
> > if 03012003 then 02282003
> > if 05012003 then 04302003
> > if 08012003 then 07312003
> > 
> > using date, I can get todays date.  But I need date math.
> 
> $ date -d "-1 day"
> Wed Jul 30 10:48:46 EDT 2003
> 
> ???

I'll take it even further:

$date -d "-1 day" +%m%d%Y
07302003

Even more:

$date -d "-3 days -1 month" +%m%d%Y
06282003

So, as Hal so eloquently put it ???

Bill Ward