How to prepend/(insert a string) in a file at arbitrary line numbers to multiple files in a directory?

Question

Appending can be done using tee command.

cat file | tee -a >> *

Is there a way to do a prepend/insertion? Thanks.

Answer 1

Using sed might help

example:

sed -i.bak '3 r tmp1.txt' settings.xml 

will add the contents of tmp1.txt after line 3 in settings.xml (and create a backup file with the .bak extension)