Now I am having two files. File A and file B. Both files contain of information inside. I am having issues on how to copy the information in file A to file B without removing or overwriting the information in file B by using Linux command prompt.
File A:
1
2
3
File B:
A
B
What i want to achieve by using Linux prompt: File B:
A
B
1
2
3
Please advice me on how should I do it, thank you!