Comment out multiple lines using vim

Reference
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Comment out multiple lines using vim

Answer:

When you want to comment out multiple lines in a configuration file or a program script, it is easy with the help of vim.

Steps:

1. Change to command mode
2. Enable visual block editing by pressing Ctrl + V
3. Select the line(s)
4. Press "I", enter the character you needed, e.g. "#"
5. Press "Esc", then "Enter"