update docs [skip ci]

docs/commands.md

@@ -62,3 +62,10 @@ Omit `--receipts-output` or `--logs-output` options if you want to export only l
 You can tune `--batch-size`, `--max-workers` for performance.
 
 [Receipts and logs schema](schema.md#receiptscsv).
+
+#### get_block_range_for_date
+
+```bash
+> iconetl get_block_range_for_date --provider-uri=https://ctz.solidwallet.io/api/v3 --date 2019-01-01
+156585,157566
+```

docs/exporting-the-blockchain.md

@@ -3,3 +3,21 @@
 1. Install python 3.6+ https://www.python.org/downloads/
 
 1. Install ICON ETL: `> pip3 install icon-etl`
+
+1. Export all:
+
+```bash
+> iconetl export_all --help
+> iconetl export_all -s 0 -e 10000000 -b 100000 -o output
+```
+
+In case `iconetl` command is not available in PATH, use `python3 -m iconetl` instead.
+
+The result will be in the `output` subdirectory, partitioned in Hive style:
+```bash
+output/blocks/start_block=00000000/end_block=00099999/blocks_00000000_00099999.csv
+output/blocks/start_block=00100000/end_block=00199999/blocks_00100000_00199999.csv
+...
+output/transactions/start_block=00000000/end_block=00099999/transactions_00000000_00099999.csv
+...
+```