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bash: Process Substitution

 
 3.5.6 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.  Note that no space may appear between the '<' or '>'
 and the left parenthesis, otherwise the construct would be interpreted
 as a redirection.  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.
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