I currently have daily files that come in via FTP with incorrect dates in the first column of the file. I have figured out how to deduct one day to derive the correct date and print this to a new file. however as they files come in every day the file name will change and I want to cron the script.

My question is how do I get my script to identify the date appended on the end of the in file file and append to the output file?

data contained in file:

End Date,Name,Amount
02/07/2014,data1, data2
02/02/2014,data1, data2
02/06/2014,data1, data2
02/06/2014,data1, data2
02/06/2014,data1, data2
02/10/2014,data1, data2
02/12/2014,data1, data2
02/20/2014,data1, data2
02/20/2014,data1, data2
02/21/2014,data1, data2
02/28/2014,data1, data2

Script:

awk 'BEGIN{FS=OFS=","} NR==1 {print} NR>1 awk {("date -d \""$1" -1 day\" +%m/%d/%Y")|getline newline; $1=newline; print}' wrongdates{date1}.csv > correctdates{date1}.csv

'Date1' format is usually 20140228 or %Y%m%d