coproc

Bash builtin for creating interactive asynchronous subshells.

Run a subshell asynchronously

$ coproc { [command1; command2; ...]; }

Create a coprocess with a specific name

$ coproc [name] { [command1; command2; ...]; }

Write to a specific coprocess stdin

$ echo "[input]" >&"$[{name][1]}"

Read from a specific coprocess stdout

$ read [variable] <&"$[{name][0]}"

Create a coprocess which repeatedly reads stdin and runs some commands on the input

$ coproc [name] { while read line; do [command1; command2; ...]; done }

Create and use a coprocess running bc

$ coproc BC { bc --mathlib; }; echo "1/3" >&"${BC[1]}"; read output <&"${BC[0]}"; echo "$output"