TIL: #Vim can do
:w >> filename
to _append_ to a file.
(You can omit "filename" to append to the current file.)
Also, :w accepts a range, so if you want to append only a few lines from the current buffer (e.g. by selecting them in visual mode), you can do that.
And :w also accepts a range when _not_ appending, allowing you to save only a selection of lines in the current buffer to the current file. (You might need to use :w! if it's an existing file, to protect you from fuckups.)
But what I originally went into the manual for:
You might know that you can open multiple files in split windows, using something like
vim -o file1 file2 file3
But if you forgot the -o and would like to do it after #Vim is already open, the :all command is what you're looking for.
(There's also -O for vertical splits, equivalent to :vert all, and -p, equivalent to :tab all.)
@scy You can also split your window ("CTRL+w v" or "CTRL+w s") and then use
:b <tab><tab><...>
to tab through the files you specified on the command line to selectively put files into the split window. Handy for editing many files and keeping a list of files to tab into ready.
scy
Max
Bastian Greshake Tzovaras