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Through 'ed' works slow. I think I like this the best:
find . -type f -name "*.c" -exec sh -c 'cat Head.txt "$1" > test.txt && mv test.txt "$1"' sh {} \;

What is the 'H' command doing? Why is it required?

Anyone knows how I can change this script so that it works recursively as well (meaning: *.c files in sub directories will get changed as well)?
for file in *.c
do
cat file.txt "$file" >...

Excellent! Thanks guys. I appreciate all your help.

Thanks guys. One more difficulty. I run the following script from cygwin:

#!/bin/bash
for file in *.c
do
cat Head.c "$file" > tempfile && mv tempfile "$file"
done

...and get the following...

Actually, I wanted to find a batch script that applies this insert 'file.txt' to all .c files in the current directory. So, in that case awk might be the best solution I guess:

find . -name "*.c"...

sed '1r file.txt' <source.txt >desti.txt

This example will insert 'file.txt' between line 1 and 2 of source.txt.
sed '0r file.txt' <source.txt >desti.txt
gives an error message.

Does anyone...