coproc

all

Bash builtin for creating interactive asynchronous subshells.

Options (1)

-l, --mathlibboolean

Create and use a coprocess running `bc`

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

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

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

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

Create a coprocess which repeatedly reads `stdin`, runs a pipeline on the input, and writes the output to `stdout`

coproc name { while read line; do echo "$line" | command1 | command2 | ... | cat /dev/fd/0; done }

Create and use a coprocess running `bc`

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