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=Example= | =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. | 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> | |||
coproc bc | |||
for i in {1..10} | |||
do | |||
echo $i'*'$i >&${COPROC[1]} | |||
read -u ${COPROC[0]} msg | |||
echo $msg | |||
done | |||
kill $COPROC_PID | |||
</syntaxhighlight> | |||
OUTPUT | |||
<pre> | |||
1 | |||
4 | |||
9 | |||
16 | |||
25 | |||
36 | |||
49 | |||
64 | |||
81 | |||
100 | |||
</pre> | |||
Run sed with buffering disabled, using coproc. | |||
<syntaxhighlight lang=bash> | <syntaxhighlight lang=bash> | ||
coproc stdbuf -o0 sed 's/.*/msg: &/' | coproc stdbuf -o0 sed 's/.*/msg: &/' | ||
| Linha 8: | Linha 32: | ||
do | do | ||
echo $i >&${COPROC[1]} | echo $i >&${COPROC[1]} | ||
read -u ${COPROC[0]} | read -u ${COPROC[0]} msg | ||
echo $ | echo $msg | ||
done | done | ||
kill $COPROC_PID | kill $COPROC_PID | ||
Edição das 11h46min 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 bc
for i in {1..10}
do
echo $i'*'$i >&${COPROC[1]}
read -u ${COPROC[0]} msg
echo $msg
done
kill $COPROC_PID
OUTPUT
1 4 9 16 25 36 49 64 81 100
Run sed with buffering disabled, using coproc.
coproc stdbuf -o0 sed 's/.*/msg: &/'
for i in {1..10}
do
echo $i >&${COPROC[1]}
read -u ${COPROC[0]} msg
echo $msg
done
kill $COPROC_PID
OUTPUT
msg: 1 msg: 2 msg: 3 msg: 4 msg: 5 msg: 6 msg: 7 msg: 8 msg: 9 msg: 10