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Пользовательские команды

`diff.1p` ( 1 )

сравнить два файла (compare two files)

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 used only if one of the file1 or
       file2 operands references standard input. See the INPUT FILES
       section.

Исходный текст на man7.org