(ed.info)Limitations

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Enter node , (file) or (file)node

7 Limitations
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If the terminal hangs up, 'ed' attempts to write the buffer to the file
'ed.hup' or, if this fails, to '$HOME/ed.hup'.

   'ed' processes FILE arguments for backslash escapes, i.e., in a
filename, any character preceded by a backslash ('\') is 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: 2 'pointer's, 1 'long int', and 1 'int'.