Make FIFOs (named pipes). More information: https://www.gnu.org/software/coreutils/mkfifo.
- Create a named pipe at a given path:
mkfifo {{path/to/pipe}}
- Send data through a named pipe and send the command to the background:
echo {{"Hello World"}} > {{path/to/pipe}} &
- Receive data through a named pipe:
cat {{path/to/pipe}}