hi could u tell me how to use sed for the following issue:

i have 2 files A and B . A has say 100lines:
line1
line2
line3
.
.
.
line100

i want to read data from file A and save it in file B as :
line1, line2, line3, ... line99, line100

that is in a single line.
What is the best way to do this...i thought of using the sed command
sed -i '1,$s/$/" parameter "/' fileB

but cudnt get how to read the text from fileA and pass it as a paramete to the Sed command?

Jithinravi,
Sorry, my mistake, it is "paste" with the "s":

nope sorry!! it says pate command not found.