Shell Programming and Scripting

timedout_read() {
  timeout=$1
  varname=$2
  old_tty_settings=`stty -g`
  stty -icanon min 0 time ${timeout}0
  eval read $varname
  stty "$old_tty_settings"
}

timedout_read 1 TEST

#!/bin/bash
 
_key()
{
  local kp
  ESC=$'\e'
  _KEY=
  read -d '' -sn1 _KEY
  case $_KEY in
    "$ESC")
        while read -d '' -sn1 -t1 kp
        do
          _KEY=$_KEY$kp
          case $kp in
            [a-zA-NP-Z~]) break;;
          esac
        done
    ;;
  esac
  printf -v "${1:-_KEY}" "%s" "$_KEY"
}
 
_key x
 

case $x in
  $'\e[11~' | $'\e[OP') key=F1 ;;
  $'\e[12~' | $'\e[OQ') key=F2 ;;
  $'\e[13~' | $'\e[OR') key=F3 ;;
  $'\e[14~' | $'\e[OS') key=F4 ;;
  $'\e[15~') key=F5 ;;
  $'\e[16~') key=F6 ;;
  $'\e[17~') key=F7 ;;
  $'\e[18~') key=F8 ;;
  $'\e[19~') key=F9 ;;
  $'\e[20~') key=F10 ;;
  $'\e[21~') key=F11 ;;
  $'\e[22~') key=F12 ;;
  $'\e[A' ) key=UP ;;
  $'\e[B' ) key=DOWN ;;
  $'\e[C' ) key=RIGHT ;;
  $'\e[D' ) key=LEFT ;;
  ?) key=$x ;;
  *) key=??? ;;
esac
 
echo "You have pressed $key"

echo -n "Enter character: "
stty cbreak
char=`dd if=/dev/tty bs=1 count=1 2>/dev/null`
stty -cbreak
echo " Character was: $char"

./test.sh: read: illegal option: -d
read: usage: read [-r] [-p prompt] [-a array] [-e] [name ...]
./test.sh: printf: illegal option: -v
printf: usage: printf format [arguments]
You have pressed ???

unknown mode: cbreak
^[[B
unknown mode: -cbreak

	stty raw
	sel=`dd if=/dev/tty bs=1 count=1 2>/dev/null`
	stty -raw

read sel

case $sel in
		1)  KEY=1 ; NUM=$sel
	;;
		2)  KEY=2 ; NUM=$sel
	;;
		3)  KEY=3 ; NUM=$sel
	;;
		4)  KEY=4 ; NUM=$sel
	;;
		5)  KEY=5 ; NUM=$sel
	;;
		6)  KEY="" ; QUIT="Y" 
	;;
		["Q","q"]) KEY="" ; QUIT="Y" 
	;;
		$'\e[A' ) 
		if [ $NUM -eq 1 ]
		then
			NUM=6
		else
			NUM=$(($NUM - 1)) 
		fi
	;;
		$'\e[B' ) 
		if [ $NUM -eq 6 ]
		then
			NUM=1
		else
			NUM=$(($NUM + 1)) 
		fi
	;;
		"") KEY=$NUM 
	;;
		*) echo "ERROR"
	;;
	esac

	echo -n "Choose one: " 
	stty raw
	sel=`dd if=/dev/tty bs=1 count=1 2>/dev/null`
	stty -raw
		
	case $sel in
		1)  KEY=1 ; NUM=$sel
	;;
		2)  KEY=2 ; NUM=$sel
	;;
		3)  KEY=3 ; NUM=$sel
	;;
		4)  KEY=4 ; NUM=$sel
	;;
		5)  KEY=5 ; NUM=$sel
	;;
		6)  KEY="" ; QUIT="Y" 
	;;
		["Q","q"]) KEY="" ; QUIT="Y" 
	;;
		$'\e[A' ) 
		if [ $NUM -eq 1 ]
		then
			NUM=6
		else
			NUM=$(($NUM - 1)) 
		fi
	;;
		$'\e[B' ) 
		if [ $NUM -eq 6 ]
		then
			NUM=1
		else
			NUM=$(($NUM + 1)) 
		fi
	;;
		"") KEY=$NUM 
	;;
		*) echo "ERROR"
	;;
	esac