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Пользовательские команды

`m4.1p` ( 1 )

макропроцессор (macro processor)

Prolog | Name | Synopsis | Description | Options | Operands | Stdin | Input files | Environment variables | Asynchronous events | Stdout | Stderr | Output files | Extended description | Exit | Consequences of errors | Application usage | Examples | Rationale | Future directions | See also |

Стандартный вывод (Stdout)

The standard output shall be the same as the input files, after
       being processed for macro expansion.

Исходный текст на man7.org