UNIX for Dummies Questions & Answers

Hi,
I need to concatenate two files as long as both files are present. As of now, I am using the following code:

Code:

#!/bin/bash
for y in {1..14}
do
	cat -s $y.F $y.R > $y.1
done

However, the outputfile is being generated even in the absent of both infiles. I would like to search for both infiles first and then cat them if the are present. If not I should move to the next pair of files. I though that using an IF statement will do it but I am not quite sure how to make it work:

Code:

#!/bin/bash
for y in {1..14}
do
	if [ "${y}" == $y.F ] # I need to modify this section so I can look for both files y.F and y.R
	then
		cat $y.F $y.R > $y.1
	fi
done

Of course, the scrip above is not working. I will be very thankful if someone can help me correct the script or suggest a better way to accomplish this task.
May be find?

Code:

find -name $y.R -exec cat $y.F '{}' \;

Code:

[ -e "$y.F" -a -e "$y.R" ] && cat $y.F $y.R > $y.1 || echo "No files present"

Thanks!