Running this ed command will reverse the lines in the current buffer. This would be useful for logfiles and the like:

:g/^/m0

Use C-x C-w to save a buffer under an alternate name.

Use split to move blocks of text around rather than having multiple terminals open. Open the file you want using the split command:

split: path/to/file

C-w and then k or j will move you between vertically between the buffers when you are not in insert mode (up and down, respectively). For example, this makes moving text between files much easier.