IFS read demo

bash-4.1$ echo ">$IFS<"
>
<

bash-4.1$ IFS=: arr=($PATH)

bash-4.1$ echo ">$IFS<"
>:<

bash-4.1$ IFS=$' \t\n'

bash-4.1$ IFS=: read -a arr <<< "$PATH"

bash-4.1$ echo ">$IFS<"
>
<

bash-4.1$ printf "%s\n" "${arr[@]}"
/usr/local/bin
/usr/bin