Yesterday's date on Linux

01-03-2008	#1 (permalink)
sape007 Just Joined! Join Date: Jan 2008 Posts: 13	Yesterday's date on Linux Hi, OS: RedHad 4 I use below in my .sh script DAY=`(date '+%a')` how can I get DAY_1 to have yesterday's day and DAY_2 to have day for two days ago. No luck with the man pages Thanks in advance for any help.

01-03-2008	#2 (permalink)
devils casper Super Moderator Join Date: Jun 2006 Location: Chandigarh, India Posts: 21,058	Hi and Welcome ! Code: DAY_1=`(date --date='1 days ago' '+%a')` DAY_2=`(date --date='2 days ago' '+%a')` echo $DAY_1 $DAY_2 __________________ It takes a lot of time to be a genius, you have to sit around so much doing nothing, really doing nothing. - Gertrude Stein New Users: Read This First

01-03-2008	#3 (permalink)
sape007 Just Joined! Join Date: Jan 2008 Posts: 13	Thank you very much.

01-03-2008

#4 (permalink)

wje_lf

Linux Engineer

Join Date: Sep 2007

Location: Mariposa

Posts: 1,192

Since my man page doesn't cover that little trick, I went a'googling. I found enough info to help me write this demonstration script:

Code:

#!/bin/bash

set -o verbose on
date
date --date=now
date --date=today # same thing
date --date='3 seconds'
date --date='3 seconds ago'
date --date='4 hours'
date --date='tomorrow'
date --date='1 day'
date --date='1 days'
date --date='yesterday'
date --date='1 day ago'
date --date='1 days ago'
date --date='1 week'
date --date='1 fortnight'
date --date='1 month'
date --date='1 year'

Running it gave this output:

Code:

date
Thu Jan  3 07:42:47 PST 2008
date --date=now
Thu Jan  3 07:42:47 PST 2008
date --date=today # same thing
Thu Jan  3 07:42:47 PST 2008
date --date='3 seconds'
Thu Jan  3 07:42:50 PST 2008
date --date='3 seconds ago'
Thu Jan  3 07:42:44 PST 2008
date --date='4 hours'
Thu Jan  3 11:42:47 PST 2008
date --date='tomorrow'
Fri Jan  4 07:42:47 PST 2008
date --date='1 day'
Fri Jan  4 07:42:47 PST 2008
date --date='1 days'
Fri Jan  4 07:42:47 PST 2008
date --date='yesterday'
Wed Jan  2 07:42:47 PST 2008
date --date='1 day ago'
Wed Jan  2 07:42:47 PST 2008
date --date='1 days ago'
Wed Jan  2 07:42:47 PST 2008
date --date='1 week'
Thu Jan 10 07:42:47 PST 2008
date --date='1 fortnight'
Thu Jan 17 07:42:47 PST 2008
date --date='1 month'
Sun Feb  3 07:42:47 PST 2008
date --date='1 year'
Sat Jan  3 07:42:47 PST 2009

__________________
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Bill

Old age and treachery will overcome youth and skill.