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sed '/\(.*\)/{G;s/\(.*\)\(\n\)/\1\2extra\1\2extraextra\1/;}' file

Just check my HP box and got the same result that you did. Try this on your sed:

sed '/\(.*\)/{G;s/\(.*\)\(\n\)/\1\2extra\1/;}' file

or

echo files|sed...

check that the \ is in front on the n

sed 's/\(.*\)/\1\nextra\1/'

Hmmm:

file:
line1
line2
line3

cat file|sed 's/\(.*\)/\nextra\1/'>newfile

cat newfile
line1
extraline1
line2
extraline2
line3
extraline3

Maybe I don't understand what you actually...

try:
sed 's/\(.*\)/\1\nextra\1/'