: is it possible to open a filehandle on a file change one line in that file
: without outputing to another file.

You can open the file, seek() to a particular position in it, and start
overwriting the file at that position, but when you reach the end of
that line, you'll keep on writing past it and into the next one. There's
no way to change one line without rewriting the file.

-- tdk

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