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awk command : row by row merging of two files

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Old 08-16-2010
Question awk command : row by row merging of two files
I want to write a scrpit to merge files row wise (actually concatinating)

Code:
main.txt
X Y Z

file 1 
A B C

file 2
1 2 3

now i want the script to check if the file1 is empty or not, if empty then make it like

Code:
A B C
1 2 3

again to check if second file is empty if not do as done previously or else append the third file.

everytime it has to update the main.txt file (i.e tht will be my output file)

I have used some code but it dosent work
Code:
R_path="${HOME}/Desktop/at/examples_own/RESULTS"
B_path="${HOME}/Desktop/at/examples_own/BATHYMETRY"
dummyprofile=seaprofile1
outputdummyfile=profile1.txt
dummyfile=seamount1


awk BEGIN { while ((getline first < ""${R_path}/output_delay.txt"") > 0 \
                  && (getline second < ""${R_path}/$outputdummyfile"") > 0)
                   { print first
                     print second  }
            while  ((getline first < ""${R_path}/output_delay.txt"") > 0)
                   { print first}
 
            while ((getline second < ""${R_path}/$outputdummyfile"") > 0)
                   { print second }
} output_delay.txt

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