Write Lines To Another File Using Vim/Vi

This page answers questions like these:

• How to write some lines of a file to a new file using vim/vi?
  
• How to write some lines of a file to another file using vim/vi?
  
• How to write specific line numbers from one file to another using vim/vi?
  

Copy Specific Line Numbers from One File to Another File:

• Open FILE1 using vim/vi.
• Write (w) from line 4 to line 17 (inclusive) to FILE2.

Copy Some Lines of One File to Another File:

• Open FILE1 using vim/vi.
• Move to any position on the first line you want to copy (using commands like j, /, %, etc.)
• Mark (m) that line as a. (In fact, you can use any letter from a to z or A to Z that you choose.)
• Move to any position on the last line you want to copy (using commands like j, /, %, etc.)
• Write (w) from the line marked a (i.e. 'a) to the current line (i.e. .) (inclusive) into FILE2.
• N.B. If you marked the last line first, then moved to the first line, you can write out the lines using :.,'aw!FILE2 instead.