'if EOF || Error' or 'if ! read-is-OK'
Latter applies for ordinary files also, no? No need of look ahead.
This is the next-to-last line, not the last line. sed does test for it,
but because the result would be off-by-one, it has to look ahead one line.
in interactive or line-by-line example shown, it's buggy.
No. sed is not meant for "interactive or line-by-line" usage. What
matters is only the output.
Paolo
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