Date to be displayed in two digits

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# 1  
Old 08-06-2009
Date to be displayed in two digits

I want the date to be displayed in two digits.

I have written a script to calculate yesterday's date. I'm getting the yesterday's date as 2009085.

Desired output:


Find the script below:

### Script to get Yesterday Date #############
Y=`date +'%Y'`
M=`date +'%m'`
D=`date +'%d'`
echo $today
if [ $M -eq 01 -o $M -eq 03 -o $M -eq 05 -o $M -eq 07 -o $M -eq 08 -o $M -eq 10 -o $M -eq 12 ] && [ $D -eq 01 ];then
yesterday=$Y$M`expr $D + 30`
echo $yesterday
if [ $M -eq 04 -o $M -eq 06 -o $M -eq 09 -o $M -eq 11 ] && [ $D -eq 01 ]; then
yesterday=$Y$M`expr $D + 29`
echo $yesterday
if [ $M -eq 02 -a $D -eq 01 ]; then
yesterday=$Y$M`expr $D + 27`
echo $yesterday
yesterday=$Y$M`expr $D - 1`
echo $yesterday

# 2  
Old 08-06-2009

Perhaps you could try:

yesterday=$Y$M$(printf "%02d" $(expr $D - 1))

# 3  
Old 08-06-2009
Or if you are in GMT timezone:

echo "Yesterday : $(TZ=GMT24BST;date +'%Y%m%d')"
echo "Today     : $(date '+%Y%m%d')"
echo "Tomorrow  : $(TZ=GMT-24BST;date '+%Y%m%d')"

Yesterday : 20090805
Today     : 20090806
Tomorrow  : 20090807

# 4  
Old 08-06-2009
If the version of Korn Shell that you are using is ksh93, there is a much simplier way of doing it
$ printf "%(%Y%m%d)T\n" now
$ printf "%(%Y%m%d)T\n" yesterday

# 5  
Old 08-06-2009
Does anyone actually use ksh93? It has some nice features, but it's never the default, never standard, and Solaris doesn't even ship with it (certainly none of the Solaris servers I look after has it) - which doesn't bode well for portability if you use it.

I'd be interested to know if it has a place.
# 6  
Old 08-06-2009
Rarely used in portable shell scripts.
# 7  
Old 08-11-2009
Does anyone actually use ksh93? It has some nice features, but it's never the default, never standard, and Solaris doesn't even ship with it (certainly none of the Solaris servers I look after has it) - which doesn't bode well for portability if you use it.
Actually it is the default shell on the latest version of OpenSolaris and Solaris. And Solaris has shipped with it for years. Just man dtksh. CDE relies on it.

And the Posix shell standard was mostly based on ksh93.

And if you want floating point support within a shell ....

Last edited by fpmurphy; 08-11-2009 at 01:37 PM..
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