I've really been skimming through the manual as of today. It says for using the w command in GNU ed:
'(1,$)w file Writes the addressed lines to file. Any previous contents of file are lost without warning. If there is no default filename, then the default filename is set to file, otherwise it is unchanged. If no filename is specified, then the default filename is used. The current address is unchanged. If file is prefixed with a bang (!), then it is interpreted as a shell command and the addressed lines are written to its standard input, (see shell escape command '!' below). In this case the default filename is unchanged. Writing the buffer to a shell command does not prevent the warning to the user if an attempt is made to overwrite or discard the buffer via the 'e' or 'q' commands. To write to a file whose name begins with a bang, prefix the name with ./.' Testing this out, instead of writing the contents of the buffer into a file on the disk, it redirects the address range as stdin to an external program if said filename starts with an exclamation mark. 1,$w !less would be an example to read the entire buffer into less without saving it at all. But is that really what happens? I want to ensure this is happening exactly as I think it is happening. Because if yes, the idea of putting ANSI escape sequences into ed will be completely not necessary. I could just redirect the address range of the buffer to read it cleanly, even if I did not save it at all by starting ed without a filename. If there is any potential side-effects to redirecting to less, let me know. I thank you for your time, and have a happy hacking.