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Full Discussion: Date function question
Top Forums UNIX for Dummies Questions & Answers Date function question Post 7011 by Perderabo on Monday 17th of September 2001 03:10:36 PM
Old 09-17-2001
Well, I'm bored this afternoon...so
Code:
#!/usr/bin/ksh

set -A months 0 31 28 31 30 31 30 31 31 30 31 30 31
typeset -Z2 month_y day_y

today=$(date +%m%d%Y)

month_t=${today%??????}
year_t=${today#????}
day_t=${today%????}
day_t=${day_t#??}

((year_t % 100)) && ((leap = !(year_t % 4))) || ((leap = !(year_t % 400)))
((leap)) && ((months[2] = months[2] + 1))

((year_y = year_t))
((month_y = month_t))
((day_y = day_t - 1))

if ((!day_y)) ; then
   ((month_y = month_y - 1))
   if ((!month_y)) ; then
      ((year_y = year_y-1))
      ((month_y = 12))
   fi
   ((day_y = months[month_y]))
fi

yesterday=${month_y}${day_y}${year_y}
echo yesterday = $yesterday
	
exit 0

I think I got this right...I only tested it lightly.
These 2 Users Gave Thanks to Perderabo For This Post:
pradeep.aradhya RavinderSingh13
 

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LEARN ABOUT DEBIAN

mhc2palm

mhc(1)							      General Commands Manual							    mhc(1)

NAME

       mhc2palm - add/copy articles from mhc to PalmOS.

SYNOPSIS

       mhc2palm [options] files...

DESCRIPTION

       This  manual  page documents briefly the mhc2palm commands.  This manual page was written for the Debian GNU/Linux distribution because the
       original program does not have a manual page.

       mhc2palm is a program that add or copy articles from mhc to PalmOS.

OPTIONS

       A summary of options is included below.

       -a     Add mhc articles to a palm.  all the original records of the palm will remain.

       -i     Copy mhc articles into the palm.	all the original records of palm will be lost.

       -n     Do nothing effectives. Useful for checking.

       -d dev Set the device file connected to the palm. default value is /dev/pilot.

       -r dir Set repository directory of the mhc. default is ~/Mail/schedule.

       YYYYMMDD-yyyymmdd
	      set a start and end date of scanning mhc. if omitted, scan from 3 months ago to 3 months after.

SEE ALSO

       adb2mhc(1) gemcal(1), mhc-sync(1), palm2mhc(1), today(1), mhc(5).

AUTHOR

       This program was written by Yoshinari Nomura <nom@quickhack.net> and this manual page was written by  Fumitoshi	UKAI  <ukai@debian.or.jp>,
       for the Debian GNU/Linux system (but may be used by others).

								    23 Jun 2000 							    mhc(1)
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