📅  最后修改于: 2022-03-11 14:50:56.556000             🧑  作者: Mango
how to add lines inside a file
sed -i -e "50r../../../../folder1/lines_to_add.txt" a.txt
a.txt - the file you want to change.
50r is line number of a.txt
some lines are inside lines_to_add.txt file
../../../../folder/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"