COPROC

Articles

• Entendendo Coprocessos (coproc) Do Bash

Example

Run a "bc" in a subshell and keep it running to call multiple times from a loop without the overhead to instantiate "bc" every single iteration.

coproc stdbuf -o0 sed 's/.*/msg: &/'
for i in {1..10}
do 
  echo $i >&${COPROC[1]}
  read -u ${COPROC[0]} rc
  echo $rc
done
kill $COPROC_PID

OUTPUT

1
4
9
16
25
36
49
64
81
100