Путеводитель по Руководству Linux

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   at.1p    ( 1 )

выполнять команды позже (execute commands at a later time)

Стандартный ввод (Stdin)

The standard input shall be a text file consisting of commands
       acceptable to the shell command language described in Chapter 2,
       Shell Command Language.  The standard input shall only be used if
       no -f file option is specified.