topic Re: date manipulation in shell script in Operating System - HP-UX

date manipulation in shell script

Paolo Gilli — Fri, 07 May 2004 10:57:01 GMT

Hi,
I, i need to write a shell script where is possible assign to a variable the 'date' value of +n or -n days starting from current date
In other words:
I have:
SYS_DATE="$( date '+%Y%m%d' )"

how can I do something like:
YESTERDAY_DATE= "$( date '+%Y%m%d' )" -1
or
TOMORROW_DATE= "$( date '+%Y%m%d' )" +1

avoid writing date calculation routines?

any ideas?
Tahnkyou

Re: date manipulation in shell script

Patrick Wallek — Fri, 07 May 2004 10:59:47 GMT

Use a date calc routine that already written. Search for A. Clay Stephensons caljd.sh or caljd.pl script. It should be easy to find in the forums. His script will do exactly what you want.

Re: date manipulation in shell script

Patrick Wallek — Fri, 07 May 2004 11:04:24 GMT

You can download caljd.sh or caljd.pl from here:

http://www.cmve.net/~merijn/#Contrib

It is at the bottom of the page.

Re: date manipulation in shell script

A. Clay Stephenson — Fri, 07 May 2004 11:05:32 GMT

I'll make it easy for you and this is the latest version of caljd.sh.

YESTERDAY_DATE=$(caljd.sh -s -y $(caljd.sh -p 1))
echo "Yesterday = ${YESTERDAY_DATE}"
TOMORROW_DATE=$(caljd.sh -s -y $(caljd.sh -n 1))
echo "Tomorrow = ${TOMORROW_DATE}"

Invoke as caljd.sh -u for full usage and many examples (like previous date plus skip over weekends).

Re: date manipulation in shell script

Arturo Galbiati — Mon, 10 May 2004 02:46:58 GMT

I'm using the mktime SW and it's great!
http://members.rogers.com/weirdways/technogeek/source/mktime/

Art

Re: date manipulation in shell script

Paolo Gilli — Mon, 10 May 2004 02:54:10 GMT

SUPER!!!
Thankyou
Regards
Paolo

Re: date manipulation in shell script

Paolo Gilli — Mon, 10 May 2004 04:07:37 GMT

An other great help by Art!
Thakyou!