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GNU ed reference manual

6. Limitations

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.