Starting EDIT from OS/8

ACTION	COMMAND
Create a new file	`CREATE <filename>`
Edit an existing file	`EDIT <filename>`

Global EDIT Commands

The top-level EDIT prompt character is #.

ACTION	COMMAND
Read a buffer full	`R`
Append to buffer	`A` (`Ctrl-L` terminates input)
Output line numbers	`.` = current, `/` = highest
Insert before line <n>	`<n>I` (`Ctrl-L` terminates input)
Move up a line	`<`
Move down a line	`>`
List buffer	`L`
List current line	`.L`
List last line	`/L`
List line by number	`<n>L`
List range of lines	`<m>,<n>L`
Delete line(s)	`.D`, `/D`, `<n>D`, `[<m>[,<n>]]D`
Change line(s)	`.C`, `/C`, `<n>C`, `[<m>[,<n>]]C` (`Ctrl-L` terminates input)
Next page	`N` equivalent to and safer than `PKR` command, where...
Write buffer to output	`P` (a.k.a. "put")
Clear buffer	`K`
Read next buffer full	`R` (as above)
Exit	`E` (Note: `Q` does not quit without saving)
Terminate	`Ctrl-C` (can resume with OS/8 `START` command)
Search for `<char>` in line `<n>`	`<n>S` `<char>`

After searching for something per the final command above:

ACTION	COMMAND
Stop editing and return to top level	`Ctrl-G Ctrl-G`
Insert	Type characters
Delete back	`Backspace` (`Ctrl-H`)
Delete forward to end of line	`<RET>`
Split line	`Ctrl-J Ctrl-L`
Find next instance of `<char>`	`Ctrl-L`
Find next instance of `<newchar>`	`Ctrl-G<newchar>`

ACTION	COMMAND
Intrabuffer string search	`<Esc><string>` followed by `'` to begin the search from the beginning of the buffer or `"` to begin searching at the next line; follow with `L` to list the line
Interbuffer search	`J`, then as for intrabuffer search

. is the current line.

You can refer to lines relative to the current one with arithmetic: .+1 is the next line, and .-1 is the previous line.

/ is the highest line number in buffer. Subtraction works here, too: /-1 is the next-to-last line, /-2 is the one before that, etc.