(ed.info)Diagnostics

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Enter node , (file) or (file)node

8 Diagnostics
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When an error occurs, if 'ed''s input is from a regular file or here
document, then it exits, otherwise it prints a '?' and returns to
command mode. An explanation of the last error can be printed with the
'h' (help) command.

   If the 'u' (undo) command occurs in a global command list, then the
command list is executed only once.

   Attempting to quit 'ed' or edit another file before writing a
modified buffer results in an error. If the command is entered a second
time, it succeeds, but any changes to the buffer are lost.