Linux bc add 0 before the decimal point

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One, bc lacks 0 problem

bc is a powerful and commonly used calculation tool,
but when doing division operations, if the result value is less than 1, the 0 before the decimal is missing:

echo "scale=2;2/3"|bc
.66
//注意这里必须带 scale ，否则输出为 0 。

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Two, simple complement 0 method

echo $(printf "%.2f" `echo "scale=2;1/3"|bc`)
0.66

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