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Never PM for tech support. It's against the rules and doesn't get me here any faster anyway. I'm not "on call".

Well of course my program's not going to work if your input's completely...

You could look at cut and paste

cut -d, -f2 b.csv> b.tmp
cut -d, -f2 c.csv> c.tmp
paste -d, a.csv b.tmp c.tmp > final.csv

Andrew

Are they really all in the same order like that?

# open files for later
exec 5<b.csv
exec 6<c.csv
while read A B
do
# read from b.csv
read C D <&5
# add more records...

ls -lrt file-2011030[5-9]*.gz file-2011031[0-5]*.gz


Filename-Globbing is not as powerful as regular expressions, so you have to do some tricks sometimes.