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Info Node: (ed.info)Diagnostics

(ed.info)Diagnostics


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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.

   `ed' exits with 0 if no errors occurred; otherwise >0.



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