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Shell Programming and Scripting

How to get last 12 month date in YYYY.MM format?

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# 1  
Old 07-26-2015
How to get last 12 month date in YYYY.MM format?
I need the date format in YYYY.MM format and I am able to get current month date as well as previous month date with below command

Code:
PM=`date +'%Y.%m' -d 'last month'`
CM=`date +'%Y.%m' -d 'now'`

but I need to get YYYY.MM date format for previous 12 months so could you please help me how I get that in shell scripting ?
# 2  
Old 07-26-2015
I think you are looking for something like this
Code:
x=0
while [ "$x" -le 12 ]
do  date +'%Y%m' -d "$x month ago"
    ((x++))
done

Though this doesn't assign values to a variable. Does your shell support arrays?
# 3  
Old 07-27-2015
With a recent bash or ksh you could use
Code:
printf "%(%Y.%m)T\n" $(( $(printf "%(%s)T\n") - (365 * 86400) ))
2014.07

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