Обновить Readme.md

Git/common.md

@@ -0,0 +1,13 @@
+# git common stuff
+
+## change remote url
+
+```
+git remote set-url origin <new url>
+```
+
+## remove permission change from git diff
+
+```
+git config core.filemode false
+```

Git/stash.md

@@ -0,0 +1,7 @@
+# $git stash
+
+## Stashing 1 file
+
+```
+git stash push [-m <message>] [--] [<pathspec>...]
+```

Linux/certbot_nginx.md

@@ -0,0 +1,13 @@
+# Certbot renew certificate
+
+## touch nginx config
+
+```
+sudo certbot --nginx
+```
+
+## certificate only
+
+```
+sudo certbot certonly --nginx
+```

MySQL/all_foreign_keys_to_table_or_column.md

@@ -1,5 +1,4 @@
 # Find all tables whose foreign key refers to the table/column
-[SQL File](./src/branch/master/MySQL/sql/all_foreign_keys_to_table_or_column.sql)
 
 ## By table
 

MySQL/users.md

@@ -0,0 +1,101 @@
+# MySQL users actions
+
+## Show users with hosts
+
+```
+SELECT User, Host FROM mysql.user;
+```
+
+## Check user privileges
+
+```
+SHOW GRANTS FOR 'someuser'@'somehost.somedomain';
+```
+
+## Create user
+
+```
+CREATE USER 'some_user'@'somehost.somedomain' IDENTIFIED BY 'some_password';
+FLUSH PRIVILEGES;
+```
+
+## Delete user
+
+```
+DROP USER 'some_user'@'somehost.somedomain';
+FLUSH PRIVILEGES;
+```
+
+## Granting privileges
+
+### Grant all privileges
+
+```
+GRANT ALL PRIVILEGES ON *.* TO 'some_user'@'somehost.somedomain' WITH GRANT OPTION;
+FLUSH PRIVILEGES;
+```
+
+### Grant privilege on database 'some_db'
+
+```
+GRANT SELECT ON `some_db`.* TO 'some_user'@'somehost.somedomain';
+FLUSH PRIVILEGES;
+```
+
+### Grant privilege on table 'some_db'.'some_table'
+
+```
+GRANT SELECT ON `some_db`.'some_table' TO 'some_user'@'somehost.somedomain';
+FLUSH PRIVILEGES;
+```
+
+### Grant privilege to select and update some columns on table 'some_db'.'some_table'
+
+```
+GRANT SELECT (id, some_column), UPDATE (some_column) ON `some_db`.`some_table` TO 'some_user'@'somehost.somedomain';
+```
+
+### Grant with inheritance
+
+```
+GRANT SELECT, INSERT, UPDATE, DELETE ON `some_db`.* TO 'some_user'@'somehost' WITH GRANT OPTION;
+FLUSH PRIVILEGES;
+```
+
+**'WITH GRANT OPTION'** makes it possible to convey to others what is permitted to oneself.
+
+## Revoking privileges
+
+### Revoke privilege to select from database 'somedb'
+
+```
+REVOKE SELECT ON `somedb`.* FROM 'someuser'@'somehost';
+FLUSH PRIVILEGES;
+```
+
+### Revoke all privileges from user
+
+```
+ALL PRIVILEGES ON *.* FROM 'someuser'@'somehost';
+FLUSH PRIVILEGES;
+```
+
+### Revoke all privileges to database 'somedb' from user
+
+```
+ALL PRIVILEGES ON `somedb`.* FROM 'someuser'@'somehost';
+FLUSH PRIVILEGES;
+```
+
+### Revoke all privileges from user
+
+```
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'someuser'@'somehost';
+FLUSH PRIVILEGES;
+```
+
+## Change password
+
+```
+ALTER USER 'test_user'@'localhost' IDENTIFIED BY 'new_password';
+```

Readme.md

@@ -4,6 +4,12 @@ This is a repository with useful snippets of various kinds of code
 
 ## Structure
 
+- [Git](./src/branch/master/Git/)
+- - [stash](./src/branch/master/Git/stash.md)
+- - [common](./src/branch/master/Git/common.md)
+- [Linux](./src/branch/master/Linux/)
+- - [certbot_nginx](./src/branch/master/Linux/certbot_nginx.md)
 - [MySQL](./src/branch/master/MySQL)
 - - [all_foreign_keys_to_table_or_column](./src/branch/master/MySQL/all_foreign_keys_to_table_or_column.md)
-- - [identify_lock](./src/branch/master/MySQL/identify_lock.md)
+- - [identify_lock](./src/branch/master/MySQL/identify_lock.md)
+- - [users](./src/branch/master/MySQL/users.md)