シェルスクリプトとmy.cnfによるmysqlの追加・削除・設定

#! /bin# STRING: A string to get the default mysql password
# Example: A temporary password is generated for root@localhost: xxxxxx
# PASSWORD: intercept the obtained STRING to get the default password on the right side of localhost:localhost
# shellcheck disable=SC2006
STRING=`grep "temporary password" /var/log/mysqld.log`
PASSWORD=${STRING#*localhost: }

#! /bin# shellcheck disable=SC2006
PASSWORD="Your password"

mysql -u root -pPASSWORD -e "xxxxxxx"

[client]
user=root
password=xxxxxx

# My my.cnf file is under /etc/my.cnf, if it's not the same, you can find it yourself
# sed -i 'what line to add' Specify the file
sed -i '1i [client]' /etc/my.cnf
sed -i '2i user=root' /etc/my.cnf
sed -i '3i password=xxxxxx' /etc/my.cnf

# SQL statements
DATABASE_SQL="CREATE DATABASE IF NOT EXISTS test"
# mysql -u username -e "sql statement"
# Because the password is configured in my.cnf, you don't have to write it
mysql -u root -e "${DATABASE_SQL}"

# sql statements
TEST_SQL="CREATE TABLE IF NOT EXISTS test ( id varchar(20) NOT NULL, text varchar(20) NOT NULL) ENGINE=InnoDB"
# mysql -u username -D "database name" -e "sql statement"
mysql -u root -D "test" -e "${TEST_SQL}"

# sql statements
INSERT_SQL="insert into test values ('123', 'test')"
mysql -u root -D "test" -e "${INSERT_SQL}"

DELETE_SQL="delete from test where id='123'"
mysql -u root -D "test" -e "${DELETE_SQL}"

UPDATE_SQL="update test set text='hello' where id='123'"
mysql -u root -D "test" -e "${UPDATE_SQL}"

SELECT_SQL="select id, text from test where id='123'"
mysql -u root -D "test" -e "${SELECT_SQL}"

# before mysql5.7
SQL="update mysql set password=password("new password") where user='root'"
# mysql5.7 and later
SQL="update mysql set authentication_string=password("new password") where user='root'"

# flush privileges: flush
mysql -u root -D "mysql" -e "${SQL};flush privileges"