(ed.info.gz) Diagnostics

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 8 Diagnostics
 *************
 
 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.
 
    Exit status: 0 if no errors occurred; otherwise >0.
 

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