On Tue, Apr 09, 2019 at 04:48:30PM -0700, L A Walsh wrote: > But the implementation of process substitution in bash > isn't implemented that way in the currently released version. It > uses a tmp file on a disk of fixed size to store *all* of the output > of the 'writer' before the reader is called.
You're getting confused. Process substititutions <(cmd) >(cmd) use either a named pipe, or an entry in /dev/fd/, depending on the platform, as determined at build time. The cmd is run as a child process in the background. The <() or >() syntax is replaced by the filename of the named pipe or /dev/fd/ entry. Here documents << and here strings <<< use temporary files. No new processes are created.
