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(ed.info)Limitations

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Limitations
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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 `int's.