How do I copy a line to another location without yanking?

Explanation

The :t (copy/transfer) command duplicates the current line and places it after the specified line number. It does not affect registers.

How it works

• :t 0 copies the current line to the top of the file
• :t $ copies it to the end
• :t . duplicates the line below itself
• :t -1 duplicates the line above itself

Example

:t 0     " Copy current line to top of file
:t .     " Duplicate current line
:5t 10   " Copy line 5 to after line 10

Tips

• :t does not modify any registers (unlike yyp)
• :'<,'>t $ copies a visual selection to end of file
• :co is a synonym for :t
• The source and destination can both use ranges and patterns
• Use :t. to quickly duplicate the current line