Add Echo A Message From A SQL File as a MySQL TIL

Author: jbranchaud

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1433 TILs and counting..._
+_1434 TILs and counting..._
 
 ---
 
@@ -607,6 +607,7 @@ _1433 TILs and counting..._
 - [Display Output In A Vertical Format](mysql/display-output-in-a-vertical-format.md)
 - [Doing Date Math](mysql/doing-date-math.md)
 - [Dump A Database To A File](mysql/dump-a-database-to-a-file.md)
+- [Echo A Message From A SQL File](mysql/echo-a-message-from-a-sql-file.md)
 - [Ignore Duplicates When Inserting Records](mysql/ignore-duplicates-when-inserting-records.md)
 - [List Databases And Tables](mysql/list-databases-and-tables.md)
 - [Run Statements In A Transaction](mysql/run-statements-in-a-transaction.md)

mysql/echo-a-message-from-a-sql-file.md

@@ -0,0 +1,32 @@
+# Echo A Message From A SQL File
+
+Let's say we have a SQL file that we run to seed our database. We want to echo
+a message to stdout at the beginning of that file's execution. We can do this
+with [a MySQL client _shell
+command_](https://dev.mysql.com/doc/mysql-shell/8.0/en/mysql-shell-commands.html).
+Specifically, we need to use the `\system` or `\!` command to run our system's
+`echo` command.
+
+Here is what that could look like:
+
+```sql
+\! echo '*****************************************'
+\! echo '*                                       *'
+\! echo '*  Loading seed data into the database  *'
+\! echo '*                                       *'
+\! echo '*****************************************'
+
+insert into products ...
+```
+
+That message banner will be output when you run the script.
+
+```bash
+$ mysql -h ::1 -P 3306 -u root -D local_database < seed_data.sql
+
+*****************************************
+*                                       *
+*  Loading seed data into the database  *
+*                                       *
+*****************************************
+```