#!/bin/bash
while true
do
    read -s  -p "Enter root password: " rootpass1
    echo
    read -s  -p "Enter root password again: " rootpass2
    echo
    if  [[-z "$rootpass1"] && [-z "$rootpass2"]]
    then
         echo "Password will not be changed"
         break
    else
        if [ $rootpass1 != $rootpass2 ]
        then
            echo "Passwords are not identical"
        else
            echo "user:$rootpass1" | chpasswd
            break
        fi
    fi
done

script.sh: line 8: [: missing `]'

#!/bin/bash
read -s  -p "Enter root password: " rootpass1
echo
read -s  -p "Enter root password again: " rootpass2
echo

if  [[ -z "$rootpass1" && -z "$rootpass2" ]]
then
    echo "Password will not be changed"
else
    if [[ "$rootpass1" != "$rootpass2" ]]
    then
        echo "Passwords are not identical"
    else
        echo "user:$rootpass1" | chpasswd
    fi
fi

if  [[ -z "$rootpass1" ]] && [[ -z "$rootpass2" ]]

#!/bin/bash
while true
do
    read -s  -p "Enter admin password: " rootpass1
    echo
    read -s  -p "Enter admin password again: " rootpass2
    echo
    if  [[ -z "$rootpass1" ]] && [[ -z "$rootpass2" ]]
    then
        echo "Password will not be changed. Both are empty."
        echo
        break
    else
        if [[ $rootpass1 != $rootpass2 ]]
        then
                echo "Passwords are not identical. Try again."
                echo
        else
                echo "root:$rootpass1" | chpasswd
                echo "Password changed."
                echo
                break
        fi
    fi
done