bcで普通に割り算すると整数で値が返る。
少数で値を返したいときは、 -l オプションか、scale=桁数 使う
[~]$echo "3/2" | bc
1
[~]$echo "3/2" | bc -l
1.50000000000000000000
[~]$echo "scale=3; 3/2" | bc
1.500
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