Eosio-Blocklog

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content_title: eosio-blocklog

link_text: eosio-blocklog

eosio-blocklog is a command-line interface (CLI) utility that allows node operators to perform low-level tasks on the block logs created by a nodeos instance. eosio-blocklog can perform one of the following operations:

• Convert a range of blocks to JSON format, as single objects or array.
• Generate blocks.index from blocks.log in blocks directory.
• Trim blocks.log and blocks.index between a range of blocks.
• Perform consistency test between blocks.log and blocks.index.
• Output the results of the operation to a file or stdout (default).

Usage

eosio-blocklog <options> ...

Options

Option (=default)	Description
--blocks-dir arg (="blocks")	The location of the blocks directory (absolute path or relative to the current directory)
-o [ --output-file ] arg	The file to write the generated output to (absolute or relative path). If not specified then output is to stdout
-f [ --first ] arg (=0)	The first block number to log or the first block to keep if trim-blocklog specified
-l [ --last ] arg (=4294967295)	the last block number to log or the last block to keep if trim-blocklog specified
--no-pretty-print	Do not pretty print the output. Useful if piping to jq to improve performance
--as-json-array	Print out JSON blocks wrapped in JSON array (otherwise the output is free-standing JSON objects)
--make-index	Create blocks.index from blocks.log. Must give blocks-dir location. Give output-file relative to current directory or absolute path (default is <blocks-dir>/blocks.index)
--trim-blocklog	Trim blocks.log and blocks.index. Must give blocks-dir and first and/or last options.
--smoke-test	Quick test that blocks.log and blocks.index are well formed and agree with each other
-h [ --help ]	Print this help message and exit

Remarks

When eosio-blocklog is launched, the utility attempts to perform the specified operation, then yields the following possible outcomes:

• If successful, the selected operation is performed and the utility terminates with a zero error code (no error).
• If unsuccessful, the utility outputs an error to stderr and terminates with a non-zero error code (indicating an error).