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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 ввод (Stdin)

The standard input shall be a text file that is used if no file
       operand is given, or if it is '-'.

Исходный текст на man7.org