why i cant change mysql root password from a script? [closed] - bash

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i want to run this script for some mariadb configuration on my docker container : \
service mysql start
sed -i "s/127.0.0.1/0.0.0.0/" /etc/mysql/mariadb.conf.d/50-server.cnf
mysql -e "DELETE FROM mysql.user WHERE User='';"
mysql -e "CREATE DATABASE newdb ;"
mysql -e "CREATE USER newuser IDENTIFIED BY 'usery';"
mysql -e "GRANT ALL PRIVILEGES ON newdb.* TO newuser;"
mysql -e "ALTER USER 'root'#'localhost' IDENTIFIED BY 'rooty';"
mysql -e "FLUSH PRIVILEGES;"
but i got this problem :
ERROR 1045 (28000): Access denied for user 'root'#'localhost' (using password: NO)
from the:
mysql -e "ALTER USER 'root'#'localhost' IDENTIFIED BY 'rooty';"
line but when i execute it manualy it works fine
ps: when i run it from the script it show the error but it change the root password as well\
the script :
service mysql start
sed -i "s/127.0.0.1/0.0.0.0/" /etc/mysql/mariadb.conf.d/50-server.cnf
mysql -e "DELETE FROM mysql.user WHERE User='';"
mysql -e "CREATE DATABASE newdb ;"
mysql -e "CREATE USER newuser IDENTIFIED BY 'usery';"
mysql -e "GRANT ALL PRIVILEGES ON newdb.* TO newuser;"
#-------------------------------------------------------------------------
#this is command is for changing root password from blank to 'rooty'
mysql -e "ALTER USER 'root'#'localhost' IDENTIFIED BY 'rooty';"
#-------------------------------------------------------------------------
mysql -e "FLUSH PRIVILEGES;"```