Shell Programming and Scripting

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#Initialize arrays
for ((i=1 ; i <= $2; i++)); do
        echo "Enter starting digit of $i string"; read a[i]
        echo "Enter length in digits of $i string"; read b[i]
done 

#Skim through file, slice strings

while read line
do
            for i in "${a[@]}"; do
            str[i]=${line:${a[i]}:${b[i]}}
            done

            for i in "${str[@]}"; do
            echo -n "$i "
            done


done <$1

#Initialize arrays
for ((i=1 ; i <= $2; i++))
do	echo "Enter starting digit of $i string"; read a[i]
	echo "Enter length in digits of $i string"; read b[i]
done 

#Skim through file, slice strings
while read line
do	for ((i=1; i < $2; i++))
	do	printf '%s ' "${line:${a[i]}:${b[i]}}"
	done
	printf '%s\n' "${line:${a[$2]}:${b[$2]}}"
done <$1

for ((i=1 ; i <= $2; i++))
  do    echo "Enter starting digit and length of $i string"; IFS="," read a[$i] b[$i] REST
  done 
      
while read line
  do    for ((i=1; i < $2; i++))
          do    printf '%s ' "${line:${a[$i]}:${b[$i]}}"
          done
        printf '%s\n' "${line:${a[$2]}:${b[$2]}}"
  done <$1

$((expression))

${array_name[expression]}