1
2
3
4
5
6
Run Code Online (Sandbox Code Playgroud)
A
B
C
D
E
Run Code Online (Sandbox Code Playgroud)
1
2
3
A
4
5
6
B
Run Code Online (Sandbox Code Playgroud)
sed Rfile2.txt file1.txt >file3.txtpaste -d '\n' file1.txt file2.txt >file3.txt