fso command

The fso command saves the current item and overwrites the item when a duplicate item-ID already exists on file. This form is used when specifying an item-ID other than the one originally requested.

Syntax

fso{(file.reference}{item-ID}

Parameter(s)

item-ID Name of the item saved.
file.reference Name of the file to write to.

Example(s)

This does not mean that the command was invalid. Rather, it means that the item, main.program.original, was already on file.

ed bp main.program
top
.fs main.program.original
cmnd?

It can be overwritten as:

.fso main.program.original