Commodore PC Ms-Dos 3.2 User's Manual page 199

The Une Editor (Edlin) 127
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To edit the rest of the file, you must save some of the edited lines
on a disk to free memory. Edlin will then be able to load the
remaining unedited lines from the disk into memory. Refer to the
W (write) and A (append) commands in Chapter 7, "Edlin Com
mands," for instructions on editing large files.
HOW tO Quit Edlin Saving a file
When you finish your editing session, you can save your original
file and the updated (new) file by using the E (end) command,
discussed in Chapter 7, "Edlin Commands." Edlin renames your
original file with the extension .bak, and saves the updated file
with the filename and extension you gave when you started
edlin.
^.^^ Warning You cannot update a file with an extension of .bak
{] because when you try to save your file, edlin will always save the
original file as .bak, thereby losing your changes. If you need to
edit such a file, rename it with another extension (using the
f"^ ms-dos ren command discussed in Chapter 3, "ms-dos Com
mands"), and start edlin by using the new filename.
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