Using lines from a file while looping over an unrelated numeric range in bash

I got a task to display all bash fonts/colors/background colors in table where the text is different for each variation and is being taken from file that contains 448 words/random number(I’m working with numbers). Here is my code for displaying all variations

for i in {0..8}; do 
for j in {30..37}; do 
for n in {40..47}; do 
echo -ne "e[$i;$j;$n""mcolors"
done
echo
done
done
echo "" 

Output: enter image description here

Code for generating random numbers:

#!/bin/bash 
for ((i=0;i<$1;i++))
do
echo $RANDOM >> randomnumbers.sh
done

So the question is how can I pass numbers from randomnumbers.sh to my script so “colors” line in output changes to number being taken by order from randomnumbers.sh? Thanks!

Answer

One simple approach is to have an open file descriptor with your random numbers, and read a line from that file whenever such a value is required.

Here, we’re using FD 3, so that other parts of your script can still read from original stdin:

#!/usr/bin/env bash

# Make file descriptor 3 point to our file of random numbers (don't use .sh for data files)
exec 3< randomnumbers || exit

for i in {0..8}; do 
  for j in {30..37}; do 
    for n in {40..47}; do
      read -r randomNumber <&3                                 # read one number from FD 3
      printf 'e[%s;%s;%sm%05d' "$i" "$j" "$n" "$randomNumber" # & use in the format string
    done
    printf 'n'
  done
done
printf 'n'