output result (period -1)

happyv · #1 (**permalink**) 05-18-2007

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!

aigles · #2 (**permalink**) 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.

Ygor · #3 (**permalink**) 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}'

happyv · #4 (**permalink**) 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"?

anbu23 · #5 (**permalink**) 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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