how to add line inside a file
how to add lines inside a file
sed -i -e "48r../../../../folder1/lines_to_add.txt" a.txt
a.txt - file you want to change
48r is line number of a.txt
some lines are inside lines_to_add.txt file
../../../../scripts3_2d/lines_to_add.txt
-i update a.txt, try without -i before runthe code,
be carefull with newlines,
"keep a newline at the end of lines_to_add.txt"