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Generate Random Number using Bash Shell Script

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Generate Random Number using Bash Shell Script

In this post, I am going to share how to generate random numbers using Bash Shell.

The bash shell offers a $RANDOM variable to generate random numbers. It is a kernel random number source device.

To view $RANDOM
echo $RANDOM

# display a random integer <= 20
echo $(( RANDOM%= 20 ))
# display random number between 0 and 20.
echo $((RANDOM%20+0))

Script to Generate 10 Random Numbers

n=$RANDOM
for i in {1..10}
do
echo $((RANDOM%20+0))
done

Manual Page for Random

man 4 random




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