date command problem

[xumingyong]

How to get the date of yesterday under date command?

I checked the manual, it seems not possible.

could someone provide the shell code for me to solve this question?

Best

[Johnson Punniyalingam · Accepted solution]

Try the following command at your unix prompt:

perl -e 'print localtime(time() - 86400) . "\n" '

If your unix machine has Perl installed, then it will work.

Check below link Use the date_calc script to calculate the date you need then pass it as a parameter to your script

http://www.unix.com/unix-dummies-questions-answers/4870-days-elapsed-between-2-dates.html#post16559

Thx,
Johnson

[Dennis Handly]

>I checked the manual, it seems not possible.

Right. You would have to do time cracking and reformatting in the shell.

You can also use Clay's caljd script:
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1158441
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=541033
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=563529
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=113540
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=844856
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1157124

Johnson: They are looking for your reply to your congrats thread:
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1291891

[Heironimus]

Depending on your environment and your needs it might be easier to grab GNU date (part of coreutils), which lets you do nifty things like "date -d yesterday". Just make sure GNU date isn't in your system-wide PATH or give it a different name so that you don't have any problems with tools that expect HP's date.