BASH - Timed Input - Show countdown - bash

Question

I have a bash script that asks the user for their details.
I'm setting a limit to how long we wait for the input. I've found this and it appears to what I want.
timelimit=5
echo -e " You have $timelimit seconds\n Enter your name quickly: \c"
name=""
read -t $timelimit name
#read -t $timelimit name <&1
# for bash versions bellow 3.x
if [ ! -z "$name" ]
then
echo -e "\n Your name is $name"
else
echo -e "\n TIME OUT\n You failed to enter your name"
fi
It shows "You have 5 seconds..." any way to update the output so it shows 4,3,2,1 etc as it counts down ?
Thanks

Answer 1

I have tried most of these answers and none of them worked perfectly for me.
Been playing with this for a local developer deployment script.
This solves a few of the issues noted, like including printed output, etc.
Also wrapped as a function for portability. I'm keen to see any improvements.
Here is my solution:
#!/bin/bash
# set -euo pipefail
READTIMEOUT=5
function read_yn {
MESSAGE=$1
TIMEOUTREPLY=$2
NORMALREPLY="Y"
if [ -z "${TIMEOUTREPLY}" ]; then
TIMEOUTREPLY="Y"
fi
TIMEOUTREPLY_UC=$( echo $TIMEOUTREPLY | awk '{print toupper($0)}' )
TIMEOUTREPLY_LC=$( echo $TIMEOUTREPLY | awk '{print tolower($0)}' )
if [ "${TIMEOUTREPLY_UC}" == "Y" ]; then
NORMALREPLY="N"
fi
NORMALREPLY_UC=$( echo $NORMALREPLY | awk '{print toupper($0)}' )
NORMALREPLY_LC=$( echo $NORMALREPLY | awk '{print tolower($0)}' )
for (( i=$READTIMEOUT; i>=0; i--)); do
printf "\r${MESSAGE} [${NORMALREPLY_UC}${NORMALREPLY_LC}/${TIMEOUTREPLY_UC}${TIMEOUTREPLY_LC}] ('${TIMEOUTREPLY_UC}' in ${i}s) "
read -s -n 1 -t 1 waitreadyn
if [ $? -eq 0 ]
then
break
fi
done
yn=""
if [ -z $waitreadyn ]; then
echo -e "\nNo input entered: Defaulting to '${TIMEOUTREPLY_UC}'"
yn="${TIMEOUTREPLY_UC}"
else
echo -e "\n${waitreadyn}"
yn="${waitreadyn}"
fi
}
read_yn "TESTING" "y"
GIST: https://gist.github.com/djravine/7a66478c37974940e8c39764d59d35fa
LIVE DEMO: https://repl.it/#DJRavine/read-input-with-visible-countdownsh

Answer 2

This should work and shouldn't overwrite input, bit more long winded than the other solutions.
#!/bin/bash
abend()
{
stty sane
exit
#Resets stty and then exits script
}
DoAction(){
stty -echo
#Turn off echo
tput sc
#Save cursor position
echo -ne "\033[0K\r"
# Remove previous line
tput cuu1
#Go to previous line
tput el
#clear to end of line
echo "You have $(($time-$count)) seconds"
#Echo timer
echo -n "$Keys"
#Echo currently typed text
stty echo
#turn echo on
tput rc
#return cursor
}
main()
{
trap abend SIGINT # Trap ctrl-c to return terminal to normal
stty -icanon time 0 min 0 -echo
#turn of echo and set read time to nothing
keypress=''
time=5
echo "You have $time seconds"
while Keys=$Keys$keypress; do
sleep 0.05
read keypress && break
((clock = clock + 1 ))
if [[ clock -eq 20 ]];then
((count++))
clock=0
DoAction $Keys
fi
[[ $count -eq $time ]] && echo "you have run out of time" && abend
done
stty sane
echo Your username was $Keys
echo "Thanks for using this script."
exit 0
}
main

Answer 3

This seems to work:
$ cat test.sh
total=5 # total wait time in seconds
count=0 # counter
while [ ${count} -lt ${total} ] ; do
tlimit=$(( $total - $count ))
echo -e "\rYou have ${tlimit} seconds to enter your name: \c"
read -t 1 name
test ! -z "$name" && { break ; }
count=$((count+1))
done
if [ ! -z "$name" ] ; then
echo -e "\nyour name is $name"
else
echo -e "\ntime out"
fi

Answer 4

#!/bin/bash
timelimit=6
name=""
for (( i = 1 ; i <= $timelimit; i++ )); do
echo -ne "\rYou have $(expr $timelimit - $i) seconds. Enter your name quickly: \c"
[ ! -z "$name" ] && { break ; }
read -t 1 name
done
if [ -z "$name" ]; then
echo -e "\n TIME OUT\n You failed to enter your name"
else
echo -e "\n Your name is $name"
fi
this should work

Answer 5

This works fine and fast for me:
#!/bin/bash
#Sets starttimestamp
starttime=$(date +%s)
#Sets timeout
timeout=5
#sets successflag default to false
success=false
#Save Cursorposition
echo -n -e "\033[s"
#While time not up
while [ $(($starttime+$timeout)) -gt $(date +%s) ] ; do
#Return to saved Cursorpositon
echo -n -e "\033[u"
#Display time left
echo "$(((starttime+timeout)-$(date +%s))) seconds left"
#Ask for 1 char then go on in loop make it look like an ongoing input by adding the user variable to the prompt
if read -p foo="Username: $user" -n 1 -t 1 c ; then
#If user hits return in time c will be empty then break out of loop and set success true
if [[ $c == "" ]] ; then
success=true
break
fi
# Append latest character to user variable
user=${user}${c}
unset c
fi
done
if $success ; then
echo "Yiha!"
else
echo "Too late!"
fi