replacement cmd?

I have a file with three Columns (Id, First Name, Last Name) and a file that have one line as follows:
Id, other strings, First Name, Last Name, other strings
I want to create a new file that will replace Id, First Name, Last Name of the second file with all corresponding lines of the first file. In that sense the new file will have the same number of lines with the first one. Awk does not work since the strings that exist as default in the second file are quiet long and I got the following error:
awk: string too long near line 1

Any idea if there is any other way?

thank you

Can you give examples of the file you've got and the result you want to end up with?

Ok, I have a file with 3 columns
1,444666999,999888999000
2,777888999,888333999888
3,222888991,333222111000
etc

and I want to produce the following file:

1A444666999BN999888999000end
2A777888999BN888333999888end
3A222888991BN333222111000end
etc
Column 1 appears before A, column B appears after A and column C appears after BN. This is a pure example. In fact strings A, CB and end are too long and for that I cannot use awk to print them.
Best Regards,

This should help:

cat /var/tmp/asb
1,444666999,999888999000
2,777888999,888333999888
3,222888991,333222111000


string1=hello
string2=bye
string3=end


sed "s/\(.*\),\(.*\),\(.*\)/\1${string1}\2${string2}\3${string3}/" /var/tmp/asb
1hello444666999bye999888999000end
2hello777888999bye888333999888end
3hello222888991bye333222111000end

ok, thanks.

Hi
just try this
sed "s/\(.*\),\(.*\),\(.*\)/\1FIRSTSUBSTITUTION\2SECONDSUBST\3THIRDSUBST/" filename

{pls note that the command should be on single line

let me know how it works!

regards
kalpana