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Shell Programming and Scripting

Getting month older

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# 8  
Old 08-23-2013
If you have perl available, this script might help

Code:
#!/usr/bin/perl

use POSIX qw(strftime);
my $d = time () - 30 * 24 * 60 * 60;
my $s = strftime "%Y%m%d%H%M%S", localtime ($d);
print $s;

Save the script as, lets say 30daysago (don't forget to chmod +x 30daysago) and then use

Code:
d=$(./30daysago)

# 9  
Old 08-23-2013
If it's a calendar month, then you can simply:-
Code:
#!/bin/ksh
typeset -Z2 MM DD
date "+%Y %m %d" | read Y4 MM DD

((MM=$MM-1))
if [ $MM -eq 0 ]
then
   MM=12
   ((YY=$yy-1))
fi

echo "Date last month was $DD $MM $Y4"


Does this help? I would be concerned about just taking off 30 days as suggested earlier. On 1st March, this will report either 30th or 31st January. Smilie



Robin
Liverpool/Blackburn
UK
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