Use DEBUG Trap to step through a bash script line by line - by Julia Evans

step.sh

#!/bin/bash

# See https://jichu4n.com/posts/debug-trap-and-prompt_command-in-bash/ for a in-depth discussion
trap '(read -p "[$BASH_SOURCE:$LINENO] $BASH_COMMAND?")' DEBUG

var=2
echo $((var+2))


for i in 1 2 3 4 5
do
   echo "Welcome $i times"
done