Aritmetica in Bash

#!/bin/bash

#deasemenea puteti folosi valorile variabilelor
#am uitat sa arat in tutorial
y=3.2 #o variabila y cu valoarea 3.2
z=5.2 #o variabila z cu valoarea 5.2
x=`echo "scale=3; sqrt($y*$z)" | bc -l`
echo $x

let x=3**2
echo $x

#x = 3.2 * 2.1
x=$(echo "3.2*2.1" | bc)
echo $x

#x = 3.2 ^ 2
x=`echo "3.2^2" | bc`
echo $x

#s() c() l() l(x)/l(10) sqrt()
x=`echo "scale=3; l(11)/l(10)" | bc -l`
echo $x

fact() {
    i=$1
    f=1
    while [ $i -gt 1 ]
    do
        let f*=$i #let f=$f*$i
        let i-=1 #let i=$i-1
    done

    echo $f
}

echo -n "Introdu un nr. pentru a calcula factorialul: "
read n

rs=`fact $n`
echo "$n! = $rs"