UNIX for Dummies Questions & Answers

Hi,

I have a bash script which outputs a file with current year and month in the filename.
Last line is:

Code:

cat result_* > output.$(date +%y%m)

So for Feb 2013 this gives me output.1302

Now I am requested to run the script every first day of the month, but with the previous month in the filename.
Running the script on March 1st 2013 should not return output.1303, but should return output.1302.

Is there a way of setting that?

Many thanks,
Viscacha

Try this

Code:

cat result_* > output.$(date -d "-1days" +%y%m)

If it is running reliably and consistently on the month's first, and if you have GNU date, try

Code:

$ date -dyesterday +%y%m

If previous solutions don't work...

Code:

cat result_* > output.$(date +"%y %m"| awk '{print ($2==1)?($1-1)*100+12:($1)*100+$2-1}')

Thanks everyone.