Generate random float number in given specific ran

问题:

can someone help me in generating random float number with given specific range of number in bash (shell). I found below command but is their any other option ? (using awk or $rand commands.)

jot -p2  0 1

回答1:

If you have GNU coreutils available, you could go with:

seq 0 .01 1 | shuf | head -n1 

回答2:

To generate 1 random floating point number between 3 and 17:

$ awk -v min=3 -v max=17 'BEGIN{srand(); print min+rand()*(max-min+1)}'
16.4038

To generate 5 random floating point numbers between 3 and 17:

$ awk -v min=3 -v max=17 -v num=5 'BEGIN{srand(); for (i=1;i<=num;i++) print min+rand()*(max-min+1)}'
15.1067
4.79238
3.04884
11.3647
15.1132

Massage to suit.

回答3:

Without any external utilities, generate random real between 3 and 16.999:

a=3
b=17
echo "$((a+RANDOM%(b-a))).$((RANDOM%999))"