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date command - getting previous month

 
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# 1  
Old 06-15-2011
date command - getting previous month
Hi,

On any given day, I want to capture the month that has gone by - said otherwise, how do I capture last month?

expr date '+%m' - 1

Above expression is giving error.

Please advise

thanks

---------- Post updated at 09:28 AM ---------- Previous update was at 09:11 AM ----------

I want to do that in single step. Capturing this month in one variable and doing somehting like 'expr $this_month - 1" is not something desirable for my requirement. Please advise
# 2  
Old 06-15-2011
Needs backticks to actually execute the "date" command.
Code:
expr `date +'%m'` - 1

Beware that it will give the answer zero when the current month is January.


What Operating System do you have? Do you have GNU date?
 
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