3.4.7. Process substitution
Process substitution is supported on systems that support named pipes (FIFOs) or the /dev/fd method of naming open files. It takes the form of
<(LIST)
or
>(LIST)
The process LIST is run with its input or output connected to a FIFO or some file in /dev/fd . The name of this file 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 > signs and the left parenthesis, otherwise the construct would be interpreted as a redirection.
When available, process substitution is performed simultaneously with parameter and variable expansion, command substitution, and arithmetic expansion.
More information in Section 8.2.3 .
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