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coproc: add option placeholder (#19915)
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@@ -29,4 +29,4 @@
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- Create and use a coprocess running `bc`:
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`coproc BC { bc --mathlib; }; echo "1/3" >&"${BC[1]}"; read <&"${BC[0]}" output; echo "$output"`
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`coproc BC { bc {{[-l|--mathlib]}}; }; echo "1/3" >&"${BC[1]}"; read <&"${BC[0]}" output; echo "$output"`
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