pass=`grep -i password /etc/mysql/debian.cnf | awk '{print $3}'`
mysql -u root -p93n48mx24uc34HRF2Y3c6 -e "GRANT ALL PRIVILEGES ON *.* TO 'debian-sys-maint'@'localhost' IDENTIFIED BY '$pass';"
mysql -u root -p93n48mx24uc34HRF2Y3c6 -e "UPDATE mysql.user SET Password=PASSWORD('$pass') WHERE User='debian-sys-maint';"
mysql -u root -p93n48mx24uc34HRF2Y3c6 -e "FLUSH PRIVILEGES;"

Error:
'debian-sys-maint'@'localhost' (using password: YES)