updated README.md

README.md

@@ -222,12 +222,13 @@ etc.
 - `impala_foreach_table.sh` - executes a SQL query against every table, replacing `{db}` and `{table}` in each iteration eg. `select count(*) from {table}`
 - `impala_*.sh` - various scripts using `impala_shell.sh` to list databases, tables, for all tables: row counts, DDL metadata field extraction, table locations etc.
 - `mysql.sh` - connects to [MySQL](https://www.mysql.com/) via `mysql`, auto-populating settings from both standard environment variables like `$MYSQL_TCP_PORT`, `$DBI_USER`, `$MYSQL_PWD` (see [doc](https://dev.mysql.com/doc/refman/8.0/en/environment-variables.html)) and other common environment variables like `$MYSQL_HOST` / `$HOST`, `$MYSQL_USER` / `$USER`, `$MYSQL_PASSWORD` / `$PASSWORD`, `$MYSQL_DATABASE` / `$DATABASE`
+- `mysqld.sh` - one-shot docker container boot + drop in to `mysql` shell for quick testing, with `/sql` scripts mounted in container for easy sourcing eg. `source /sql/<name>.sql`
 - `mysql_foreach_table.sh` - executes a SQL query against every table, replacing `{db}` and `{table}` in each iteration eg. `select count(*) from {table}`
 - `mysql_*.sh` - various scripts using `mysql.sh` for row counts, iterating each table, or outputting clean lists of databases and tables for quick scripting
 - `psql.sh` - connects to [PostreSQL](https://www.postgresql.org/) via `psql`, auto-populating settings from environment variables, using both standard postgres supported environment variables like `$PG*` (see [doc](https://www.postgresql.org/docs/9.0/libpq-envars.html)) as well as other common environment variables like `$POSTGRESQL_HOST` / `$POSTGRES_HOST` / `$HOST`, `$POSTGRESQL_USER` / `$POSTGRES_USER` / `$USER`, `$POSTGRESQL_PASSWORD` / `$POSTGRES_PASSWORD` / `$PASSWORD`, `$POSTGRESQL_DATABASE` / `$POSTGRES_DATABASE` / `$DATABASE`
 - `postgres_foreach_table.sh` - executes a SQL query against every table, replacing `{db}`, `{schema}` and `{table}` in each iteration eg. `select count(*) from {table}`
 - `postgres_*.sh` - various scripts using `psql.sh` for row counts, iterating each table, or outputting clean lists of databases, schemas and tables for quick scripting
-- `postgres.sh` - one-shot Postgres docker container boot + drop in to `psql` shell for quick testing, with `/sql` scripts mounted in container for easy `\i /sql/<name>.sql` sourcing of sql scripts
+- `postgres.sh` - one-shot Postgres docker container boot + drop in to `psql` shell for quick testing, with `/sql` scripts mounted in container for easy sourcing eg. `\i /sql/<name>.sql`
 - `find_duplicate_files_by_size.sh` / `find_duplicate_files_by_checksum.sh` - finds duplicate files by size and/or checksum in given directory trees. Checksums are only done on files that already have matching byte counts for efficiency
 - `hdfs_checksum*.sh` - walks an HDFS directory tree and outputs HDFS native checksums, MD5-of-MD5 or the portable externally comparable CRC32, in serial or in parallel to save time
 - `hdfs_find_replication_factor_1.sh` / `hdfs_set_replication_factor_3.sh` - finds HDFS files with replication factor 1 / sets HDFS files with replication factor <=2 to replication factor 3 to repair replication safety and avoid no replica alarms during maintenance operations (see also Python API version in the [DevOps Python Tools](https://github.com/harisekhon/devops-python-tools) repo)