Question

2

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

rated 0 times [ 2] [ 0] / answers: 1 / hits: 1369 / 2 Years ago, thu, may 12, 2022, 5:58:38

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

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answered 2 Years ago sharall · Accepted Answer

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 "



You pressed $bb.



"

fi

}



while true; do

    read -t 1 -n 1 bb && ACTION

    echo -ne "Hello $a times. Hit "q" to quit."'

' 

    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 "



############

#          #

# Bye bye  #

#          #

############

" && 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'

'



  # 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