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BASH - Read input with visible countdown
#!/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"
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