How to run two parts of codes of Bashscript simultaneously while one of them is infinite while loop

Question

i have this bash script code and i want to run the read command side by side with the while loop as the read command fetch data from user and save it in some file and the while loop do checking on a related something , so any suggestions like doing them in both terminals or something like that

Thanks

 #!/bin/bash 
    trap "echo \"\" > /home/........./file.txt"  SIGINT SIGTERM SIGHUP
    while sleep 2
do
read -s -n 1 key   
    if [[ $key = "" ]]; then 
        echo >> somefile
    else
        echo "You pressed '$key'"
    fi
clear
done
    while sleep $sleepInterval
    do
    i=0
    while read line
    do
    somecommands
    done

Answer 1

This is how I do that:

#!/bin/bash

a=0

function ACTION ()
{
if [[ "$bb" == "Q" || "$bb" == "q" ]]; then
    echo "Good bye!"
    exit 0
else 
    echo -e "\n\nYou pressed $bb.\n\n"
fi
}

while true; do
    read -t 1 -n 1 bb && ACTION
    echo -ne "Hello $a times. Hit \"q\" to quit."'\r' 
    a=`echo "$a + 1" | bc`
done
exit 0

And this is what was answered at Stackoverflow by Andy and works great here.

The script is his (I just added the trap part as he says that terminal would be in a weird state if the script gets killed):

#!/bin/bash

trap 'echo -e "\n\n############\n#          #\n# Bye bye  #\n#          #\n############\n" && exit 1' INT 
trap 'notify-send "Bye bye" "The terminal has been closed" && exit 1' HUP

if [ ! -t 0 ]; then
  echo "This script must be run from a terminal"
  exit 1
fi

stty -echo -icanon time 0 min 0

count=0
keypress=''
while true; do
  let count+=1
  echo -ne $count'\r'

  # This stuff goes in _handle_keys
  read keypress
  case $keypress in
  # This case is for no keypress
  "")
    ;;
  $'\e[C')
    echo "derecha"
    ;;
  $'\e[D')
    echo "izquierda"
    ;;
  # If you want to do something for unknown keys, otherwise leave this out
  *)
    echo "unknown input $keypress"
    ;;
  esac
  # End _handle_keys
done

stty sane

Answer 2

i would make the inf. loop its own separate script then when i run it put a ampersand after it

#!/bin/bash
cat /var/log/dmesg
~/inf-loop.sh &
ls /var/cache/apt/archive/*.deb