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Getting yesterday DATE

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Top Forums Shell Programming and Scripting Getting yesterday DATE
# 22  
Old 12-11-2009
I am using the below script in a production machine in a backup script and it works pretty well, on 1st of Jan and 1st of March (leap years) it works correctly, considers leap year well, try it

Code:
#! /usr/bin/ksh

OFFSET=${1:-1}

case $OFFSET in
  *[!0-9]* | ???* | 3? | 29) print -u2 "Invalid input" ; exit 1;;
esac

eval `date "+day=%d; month=%m; year=%Y`
typeset -Z2 day month
typeset -Z4 year
day=$((day - OFFSET))
if (( day <= 0 )) ;then
  month=$((month - 1))
  if (( month == 0 )) ;then
    year=$((year - 1))
    month=12
  fi
  set -A days `cal $month $year`
  xday=${days[$(( ${#days[*]}-1 ))]}
  day=$((xday + day))
fi

print $year$month$day

This User Gave Thanks to EAGL€ For This Post:
alex_5161
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LEARN ABOUT DEBIAN

wiki-toolkit-revert-to-date

WIKI-TOOLKIT-REVERT-TO-DATE(1p) 			User Contributed Perl Documentation			   WIKI-TOOLKIT-REVERT-TO-DATE(1p)

NAME

       wiki-toolkit-revert-to-date - Revert the state of a Wiki::Toolkit instance to an earlier point in time.

SYNOPSIS

	 # Removes any changes made to a Wiki::Toolkit instance since a given date
	 #  (and optionally time), restoring it to the state at that point.

	 wiki-toolkit-revert-to-date --type postgres
		  --name mywiki 
		  --user wiki  
		  --pass wiki 
		  --host 'db.example.com' 
		  --port 1234 
		  --date 2007-01-05 
		  --time 11:23:21

DESCRIPTION

       Takes three mandatory arguments:

       type
	   The database type.  Should be one of 'postgres', 'mysql' and 'sqlite'.

       name
	   The database name.

       date
	   The date to revert the state back to, in the format YYYY-MM-DD

       five optional arguments:

       time
	   The time (on the specified date) to revert the state back to, in the format hh:mm:ss. If not specified, will use midnight.

       user
	   The user that connects to the database. It must have permission to create and drop tables in the database.

       pass
	   The user's database password.

       host
	   The hostname of the machine the database server is running on (omit for local databases).

       port
	   The port number that the database server is expecting connections to.

AUTHOR

       Nick Burch

COPYRIGHT

	    Copyright (C) 2006 Nick Burch.  All Rights Reserved.

       This code is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       Wiki::Toolkit

perl v5.14.2							    2011-09-25					   WIKI-TOOLKIT-REVERT-TO-DATE(1p)