如何在Bash中进行浮动比较？

Question

lock_percent=$(echo "scale = 5; $value2*100/$value1" | bc)
value=`echo "$lock_percent" | bc`

    if [[ "$value" > "$8" ]]; then
       echo "Lock Percentage:$value percentage State Critical"
       exit $STATE_CRITICAL
    fi

我无法与此进行浮动比较.我无法理解我哪里出错了.

Answer 1

Bash本身不能使用float.在这种情况下,您可以乘以10或100(等)并获得可以比较的整数值.或者,您可以使用bc比较和返回值:

echo "10.2>10.1" | bc

Answer 2

# float number comparison
fcomp() {
    awk -v n1="$1" -v n2="$2" 'BEGIN {if (n1+0<n2+0) exit 0; exit 1}'
}

# test and example
fcomp_test() {
    if fcomp "$1" "$2"; then
       echo "$1<$2"
    else
       echo "$1>=$2"
    fi
}

fcomp_test 0.0 0.1
fcomp_test 0.1 0.1
fcomp_test -0.1 0.1
fcomp_test 1e3 1e4
fcomp_test -1.34e3 1.03e4
fcomp_test ' 0 ' ' 1 '