сортировать, объединять или проверять последовательность текстовых файлов (sort, merge, or sequence check text files)
Операнды (Operands)
The following operand shall be supported:
file A pathname of a file to be sorted, merged, or checked.
If no file operands are specified, or if a file operand
is '-', the standard input shall be used. 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.
