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output result (period -1)

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# 1  
Old 05-18-2007
output result (period -1)
hello,

I have the following basic script which input the period, but I would like to output is period -1.. how?

echo Please input period (yyyymm):
read PERIOD
OUTPUT=$PERIOD -1
echo " you request period -1 is $OUT"

input 200705
output 200704
input 200701
output 200612

The above script is not work.

Please advise.

Thx!
# 2  
Old 05-18-2007
Search this forum, this problem has been answered many times.

Read this thread Getting yesterday DATE

Read this FAQ Yesterdays Date/Date Arithmetic

Read this TIP Simple date and time calulation in BASH

Jean-Pierre.
# 3  
Old 05-18-2007
Try...
Code:
echo "200701"|awk '{y=substr($0,1,4);m=substr($0,5,2)-1;if(m==0){m=12;y--};printf "%04d%02d\n",y,m}'

# 4  
Old 05-18-2007
Quote:
Originally Posted by anbu23
Code:
echo "Please input period (yyyymm):"
read PERIOD
OUTPUT=`expr $PERIOD - 1`
echo " you request period -1 is $OUTPUT"

Thx! it work now.

what is the meaning of "expr"?
# 5  
Old 05-18-2007
Quote:
Originally Posted by happyv
Thx! it work now.

what is the meaning of "expr"?
expr is a command which evaluate expressions.
I didn't read your requirement properly. My solution wont work for all the situations. Try Ygor's solution.
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