Help to do a script

[Christian Aguilar Varga]

Hello gurus,
I'm trying to make a script by using shell. I would like to substract 1 hour to the current date and to get the result in this format (Month Day Hour):

Mar 10 18 (It is March 10 at 19 hours)
Mar 9 23 (It is March 10 at 00 hours)

My variable is:
i=`date +'%-3.4h %2.1d %H'`

How can i substract 1 hour to my variable $i in shell?

[Ivan Krastev]

You can use:

h = $((i -1))

See the example here - http://www.unix.com/shell-programming-scripting/11953-korn-shell-script-getting-yesterdays-date.html

regards,
ivan

[Mark McDonald_2]

You could also move the TimeZone by an hour before running i=`date +'%-3.4h %2.1d %H'`

[James R. Ferguson]

Hi:

Use Perl;

# i=$(perl -MPOSIX -le 'print strftime "%h %2d %H",localtime(time-3600)')

# echo ${i}
Mar 10 18

Use the same date formatting directives that you are accustomed to using --- see the 'date' manpages if you like.

This above code handles one-hour (3600 second) transitions across months and years without any other effort.

Regards!

...JRF...

[Dennis Handly]

See Clay's caljd.sh script:
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1158441