It might well be in the manual, but it also should be
added to the interactive HELP cmd, which types out
Add to "P" that it APPENDS to any existing "postponed" file.
WHY is that fact NOT "obvious"?
Because the user, at least this one, uses the
"head -50" (alias head50) cmd as a quick and easy
(and usually effective) way to see what's IN a file,
eg what's been put INTO a file (by some program).
So you don't see the appended stuff.
In fact, since the head-stuff hasn't changed, you're
not quite sure just *what* happened.
(Yeah, yeah, one *should* really use an alias that
types out the (1) date, (2) date/time NOW, some
"head" of the file, then (3) blankspace/dashed-lines,
then some (4) TAIL of the file. But if we all did
what we "should" do, wouldn't it be a ...)