сортировать, объединять или проверять последовательность текстовых файлов (sort, merge, or sequence check text files)
Последствия ошибок (Consequences of errors)
The default requirements shall apply, except that if sort
encounters an error when opening or reading a file operand, it
may exit without writing any output to standard output or
processing later operands.
The following sections are informative.
