Process Substitution
Process substitution allows a process's input or output to be
referred to using a filename. It takes the form of <(list) or >(list).
The process list is run asynchronously, and its input or output appears
as a filename. This filename is passed as an
argument to the current command as the result of the expansion.
If the >(list) form is used, writing to the file will provide
input for list. If the <(list) form is used, the file passed as an
argument should be read to obtain the output of list.
Process substitution is supported on systems that support named pipes
(FIFOs) or the /dev/fd method of naming open files.
When available, process substitution is performed simultaneously with
parameter and variable expansion, command substitution,
and arithmetic expansion.
support bash-like process substitution
syntax
From the bash man-page: