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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

trash-empty

TRASH-EMPTY(1)						      General Commands Manual						    TRASH-EMPTY(1)

NAME

       trash-empty - Empty for Command line trash utility.

SYNOPSIS

       trash-empty [arguments]

DESCRIPTION

       Remove for ever any trashed file and trashed directory.	This command is a part of trash-cli package that provides a command line interface
       trashcan utility compliant with the FreeDesktop.org Trash Specification.  It remembers the name, original path, deletion date, and  permis-
       sions of each trashed file.

ARGUMENTS

       To remove all trashed files, use 'emtpy-trash'.

       To remove files that have been in the trash more than a given number of
	      days, use 'trash-empty x', 'x' representing the number of days.

EXAMPLES

       $ date
       Tue Feb 19 20:26:52 CET 2008
       $ trash-list
       2008-02-19 20:11:34 /home/einar/today
       2008-02-18 20:11:34 /home/einar/yesterday
       2008-02-10 20:11:34 /home/einar/last_week
       $ trash-empty 7
       $ trash-list
       2008-02-19 20:11:34 /home/einar/today
       2008-02-18 20:11:34 /home/einar/yesterday
       $ trash-empty 1
       $ trash-list
       2008-02-19 20:11:34 /home/einar/today
       $ trash-empty
       $ trash-list
       <none>

BUGS

       Report bugs to http://code.google.com/p/trash-cli/issues

AUTHORS

       Trash  was  written by Andrea Francia <andreafrancia@users.sourceforge.net> and Einar Orn Olason <eoo@hi.is>.  This manual page was written
       by Steve Stalcup <vorian@ubuntu.com>.  Changes made by Massimo Cavalleri <submax@tiscalinet.it>.

SEE ALSO

       trash-put(1), trash-restore(1), trash-list(1), and the FreeDesktop.org Trash Specification at http://www.ramendik.ru/docs/trashspec.html.

       Both are released under the GNU General Public License, version 2 or later.

																    TRASH-EMPTY(1)
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