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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. | 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. | ||
<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
coproc | coproc stdbuf -o0 sed 's/.*/msg: &/' | ||
for i in {1..10} | for i in {1..10} | ||
do | do | ||
echo | echo $i >&${COPROC[1]} | ||
read -u ${COPROC[0]} rc | read -u ${COPROC[0]} rc | ||
echo $rc | echo $rc | ||
Edição das 11h43min de 4 de dezembro de 2019
Articles
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