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Retun yesterday's date on HP-UX

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# 1  
Old 03-28-2011
Retun yesterday's date on HP-UX
I would like to know how to get previous day date on HP-UP.

On linux i proceed the follwoing way.

Code:
alioune@baccus ~/bashtuto/uip $ date  +%Y-%m-%d -d "1 day ago"
2011-03-27
alioune@baccus ~/bashtuto/uip $

On HP-UX
Code:
[pd_uip2:/ztesoft/uip/log/apache]$ date  +%Y-%m-%d -d "1 day ago"                               
2011-03-28
[pd_uip2:/ztesoft/uip/log/apache]$

It returns today's date.

Thx for your help
# 2  
Old 03-28-2011
That's because the "n <time_unit>" syntax is a non-standard GNU date extension. Perderabo wrote a script to do date calculations cross-platform.
# 3  
Old 03-28-2011
May not be exactly what you want , but I am sure you can edit it

date '+%y%m%d' | awk '{print $1-1}'
# 4  
Old 03-28-2011
Quote:
Originally Posted by pkabali
May not be exactly what you want , but I am sure you can edit it

date '+%y%m%d' | awk '{print $1-1}'
what happens on the first of the month?
# 5  
Old 03-28-2011
Lol, prints 00..good catch.., I am sure there is a more elegant way of doing this but worst case you could have a if statement and make use of the last day part of Perderabo's script.
# 6  
Old 03-28-2011
Code:
TZ=$(($TZ +24)) date +%Y%m%d

but to avoid offset pb :

Code:
Uday=`TZ=GMT date +%d` Uhr=`TZ=GMT date +%H` Lday=`date +%d` Lhr=`date +%H` 

if [ $Lday = $Uday ]; then
Offset=`expr $Uhr - $Lhr` else Offset=`expr $Uhr + 24 - $Lhr` fi 

Diff=`expr 24 + $Offset`
echo -n "yesterday was " TZ=GMT+$Diff date +%Y-%m-%d 

Diff=`expr 24 - $Offset`
echo -n "tomorrow will be " TZ=GMT-$Diff date +%Y-%m-%d

of course this is to be adapted depending on your plateform, but the main logic is here.

Otherwise, you can just get & install the GNU date everywhere Smilie
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