Add lines to a file bash

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"

Similar codes

34 votes165 views6 answers
Git store credentials
Shell/Bash
0 vote171 views1 answer
Rclone initial commit to remote drive
Shell/Bash
0 vote180 views1 answer
Wget to particular directory
Shell/Bash
0 vote163 views2 answers
Git stash retrieve one file
Shell/Bash
0 vote169 views1 answer
Monitor log file for string
Shell/Bash
0 vote195 views1 answer
Iris eyesaver
Shell/Bash
2 votes155 views2 answers
Bash change and make directory
Shell/Bash
0 vote199 views2 answers
Unable to import wx
Shell/Bash
1 vote185 views1 answer
Commit container to image
Shell/Bash
3 votes134 views1 answer
Install pip windows
Shell/Bash