[sclug] Happy sysadmin day

ed ed at s5h.net
Fri Jul 27 20:45:10 UTC 2007

On Fri, 27 Jul 2007 02:45:37 +0100
John Stumbles <john at stumbles.org.uk> wrote:

> (for those who haven't seen this before)
> http://eclectech.co.uk/sysadminday.php

:-( Missed it again, I normally try to send an email to everyone at
work for occasions like this.

I don't think it's possible to put a clause into a crontab entry that
can decide if today is the last occurrence of that weekday for the
month, so here's a short perl snippet, if you're like me you will have
forgotten about sysadmin day for a series of years.

It prints a short message and cron should capture and email this to the
user who owns the crontab.

My crontab entry for this is as follows:

40 8 * 7 fri /usr/bin/perl /home/ed/code/perl/last_friday.pl

And the script looks like this. Maybe next year I can mail it out on


use strict;
use warnings;

sub is_today_the_last_friday_of_month {
	my $d = time();
	my @t = localtime($d);

	if( $t[6] != 5 ) {
	my @next_week = localtime( $d + ( 7 * 24 * 60 * 60 ) );
	if( $next_week[4] eq $t[4] ) {

if( is_today_the_last_friday_of_month() ) {
	print( STDERR "Sysadmin day!!\n\n" );

The OC48 to the trailer park is bouncing like a rubber biscut because
of Bernard Shifman threatening to sue. GST is ordering a pizza.
:: http://www.s5h.net/ :: http://www.s5h.net/gpg
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