Путеводитель по Руководству Linux

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   ed.1p    ( 1 )

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Использование в приложениях (Application usage)

Because of the extremely terse nature of the default error
       messages, the prudent script writer begins the ed input commands
       with an H command, so that if any errors do occur at least some
       clue as to the cause is made available.

In earlier versions of this standard, an obsolescent - option was described. This is no longer specified. Applications should use the -s option. Using - as a file operand now produces unspecified results. This allows implementations to continue to support the former required behavior.