[ale] Linux shell process

[Michael H. Warfield]

On Mon, 2012-03-19 at 19:34 +0000, Lightner, Jeff wrote:
> Unfortunately that works with the GNU date but not with proprietary implementations.

Yeah, true...  Too bad.

What are you doing with a "proprietary implementation" then?  (Just
kidding...  Just kidding...)
 
Regards,
Mike

> -----Original Message-----
> From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of Michael H. Warfield
> Sent: Monday, March 19, 2012 3:10 PM
> To: Atlanta Linux Enthusiasts
> Cc: mhw at wittsend.com
> Subject: Re: [ale] Linux shell process
> 
> On Mon, 2012-03-19 at 16:03 +0000, Lightner, Jeff wrote:
> > I use cal to cheat at date math.  With grep and wc you can figure out many things more simply than with more esoteric methods.
> 
> For shell scripts, I use "date" for date math.
> 
> You gotta really get into the info stuff but the things you can do with
> the date --date option are simply amazing...
> 
> [mhw at canyon ~]$ date --date=yesterday
> Sun Mar 18 15:05:34 EDT 2012
> [mhw at canyon ~]$ date --date="today - 1 month"
> Sun Feb 19 14:05:41 EST 2012
> [mhw at canyon ~]$ date --date="today - 3 weeks"
> Mon Feb 27 14:05:51 EST 2012
> [mhw at canyon ~]$ date --date="Mon Feb 27 14:05:51 EST 2012 - 3 weeks"
> Mon Feb  6 14:05:51 EST 2012
> [mhw at canyon ~]$ date --date="Mon Feb 27 14:05:51 EST 2012 - 3 weeks - 6 hours"
> Mon Feb  6 08:05:51 EST 2012
> 
> It's documented in the info pages for date but not in the man pages (a
> little too complex for man, I'm afraid).
> 
> Regards,
> Mike
> --
> Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
>    /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
>    NIC whois: MHW9          | An optimist believes we live in the best of all
>  PGP Key: 0x674627FF        | possible worlds.  A pessimist is sure of it!
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-- 
Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
   /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
   NIC whois: MHW9          | An optimist believes we live in the best of all
 PGP Key: 0x674627FF        | possible worlds.  A pessimist is sure of it!
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