A script to reproduce a regression from Bash 4.4 to 5.0

bash-5-bug.sh

#!/bin/bash

echo "====="
echo "== Test #1"
echo "== Working in bash 4, broken in bash 5"
echo "====="
# Test Case 1
startTime=$(date +"%s")
recheckSleepTime=0.2

for X in $(seq 20); do
        timeDelta=$(($(date +"%s")-$startTime))
        sleepTime="$(date --date=@$timeDelta -u +"%H:%M:%S")"
        # Starting in bash 5.0 releases, the inclusion of the "columns" variable here or 
        # a call to $(tput cols) will result in the printf using \r\n rather than \r
        printf "\r\033[12G%-${COLUMNS}s" "running... ($sleepTime)"
        sleep $recheckSleepTime
done

echo ""
echo "====="
echo "== Test #2"
echo "== Broken in both bash 4 and 5"
echo "====="

## Test Case 2
startTime=$(date +"%s")
recheckSleepTime=0.2

for X in $(seq 20); do
        timeDelta=$(($(date +"%s")-$startTime))
        sleepTime="$(date --date=@$timeDelta -u +"%H:%M:%S")"
        # Starting in bash 5.0 releases, the inclusion of the "columns" variable here or 
        # a call to $(tput cols) will result in the printf using \r\n rather than \r
        printf "\r\033[12G%-$(tput cols)s" "running... ($sleepTime)"
        sleep $recheckSleepTime
done


## Test Case 3
echo ""
echo "====="
echo "== Test #3"
echo "== Working in both bash 4 and 5"
echo "====="

startTime=$(date +"%s")
recheckSleepTime=0.2

for X in $(seq 20); do
        timeDelta=$(($(date +"%s")-$startTime))
        sleepTime="$(date --date=@$timeDelta -u +"%H:%M:%S")"
        # Starting in bash 5.0 releases, the inclusion of the "columns" variable here or 
        # a call to $(tput cols) will result in the printf using \r\n rather than \r
        printf "\r\033[12G%-60s" "running... ($sleepTime)"
        sleep $recheckSleepTime
done

echo ""
echo "DONE!"