Generating random numbers that conform to a range in Bash

Question

If I run ./random.sh 10 45, it would only return random numbers between 10 and 45.

I am able to produce the random number using

randomNumber=$((1 + RANDOM % 100))

but now how can I allow user to specify upper and lower limit of random number?

Answer 1

You can use shuf

#!/bin/bash

# $1: Lower limit
# $2: Upper limit
# Todo  Check arguments

shuf -i $1-$2 -n 1

./random.sh 45 50

Answer 2

Try the following (pure BASH):

   low=10
   hgh=45
   rand=$((low + RANDOM%(1+hgh-low)))