Subtract 2 months from the date

UNIX for Advanced & Expert Users
1

I have the script which appends month and year to the name of the
file. Now every time when I append the month-year combination I
have to subtract 2 months from the current date and then append
it, since we are sending our vendor 2 months prior worth of data
eveytime.

#! /usr/bin/ksh

filefullname=$1
filename=${filefullname%.}
fileext=${filefullname##.}

DATE=`date +%m%y`

newfilename="${filename}${DATE}.${fileext}"

mv $filefullname $newfilename

I am not sure how to go about it, Any help or sample script would help me get going...

Thanks..

2

Go to the "Answers to frequently asked questions" section. You'll find a whole section on this or similar questions

3

I did happen to look into FAQ section before I posted it here..the solution is with GNU and I am looking for a pure Unix script solution...

Also our OS here does not support

date -v

solution..

Thanks

4

You'll need to read a few more, there are solutions using pure script, and perl in addition to the gnu method.

5

ie., see Perderabo's datecalc script

6

datecalc is mentioned in the third sentence and it is the first solution proposed in the faq article. :confused: