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The buffer files are kept in `/tmp/ed.*'. If the terminal hangs
up, ed attempts to write the buffer to file `ed.hup'.
ed processes file arguments for backslash escapes, i.e., in
a filename, any characters preceded by a backslash (`\') are
interpreted literally.
If a text (non-binary) file is not terminated by a newline character,
then ed appends one on reading/writing it. In the case of a
binary file, ed does not append a newline on reading/writing.
Per line overhead: 4 ints.
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