How to print output of a for loop in a single line in Bash

Question

echo -n "input: "
while read line 
do 
   array=("${array[@]}" $line)
done
len=${#array[@]}

echo -n "Output:"
for (( n=0; n<=len; n++ ))
    do 
    echo "${array[n]}" | rev
done 

I want the reversed output to be in a single line.

Answer 1

Why aren't you using a reverse loop?

sep="" # no separator before first entry
for ((n=len; n>=0; n--))
do 
    printf "%s%s" "$sep" "${array[n]}"
    sep=" "
done
printf '\n'

Generally prefer printf over echo -n, though both would work here.

Or if you just want the output to be reversed character by character;

echo "${array[@]}" | rev

But then why do you need an array at all?

read -r -p 'input: '
echo "$REPLY" | rev