兄弟连区块链入门教程以太坊源码分析CMD深入分析（二）
兄弟连区块链入门教程以太坊源码分析CMD深入分析（二），cmd包下的geth子包主函数启动的各个子命令解析
### cmd包下的geth子包主函数启动的各个子命令解析
#### /geth
* __init__
```
function:导入创世块的json,以指定的json作为创世块
args:<genesisPath>
demo: init /home/yujian/eth-go/genesis.json
notice:ethereum默认创建路径为home目录的.ethereum,如果该目录下已经写入过创世快，会执行失败
success_result_demo:
WARN [01-16|10:25:12] No etherbase set and no accounts found as default
INFO [01-16|10:25:12] Allocated cache and file handles database=/home/yujian/.ethereum/geth/chaindata cache=16 handles=16
INFO [01-16|10:25:12] Writing custom genesis block
INFO [01-16|10:25:12] Successfully wrote genesis state database=chaindata hash=bf2891…ad1419
INFO [01-16|10:25:12] Allocated cache and file handles database=/home/yujian/.ethereum/geth/lightchaindata cache=16 handles=16
INFO [01-16|10:25:12] Writing custom genesis block
INFO [01-16|10:25:12] Successfully wrote genesis state database=lightchaindata hash=bf2891…ad1419
```
* __import__
```
function:导入区块数据到当前运行的链中
args:<filename> (<filename 2> ... <filename N>)
demo: import /home/yujian/eth-block.txt
notice:如果导入的文件只要一个是错误的，那么会失败，如果有多个文件错误，那么程序会继续执行忽略错误的．
success_result_demo:
WARN [01-16|11:00:32] No etherbase set and no accounts found as default
INFO [01-16|11:00:32] Allocated cache and file handles database=/home/yujian/.ethereum/geth/chaindata cache=128 handles=1024
Import done in 306.866µs.
INFO [01-16|11:00:32] Disk storage enabled for ethash caches dir=/home/yujian/.ethereum/geth/ethash count=3
Compactions
INFO [01-16|11:00:32] Disk storage enabled for ethash DAGs dir=/home/yujian/.ethash count=2
Level | Tables | Size(MB) | Time(sec) | Read(MB) | Write(MB)
-------+------------+---------------+---------------+---------------+---------------
INFO [01-16|11:00:32] Loaded most recent local header number=0 hash=bf2891…ad1419 td=33554432
0 | 3 | 0.00094 | 0.00000 | 0.00000 | 0.00000
INFO [01-16|11:00:32] Loaded most recent local full block number=0 hash=bf2891…ad1419 td=33554432
Trie cache misses: 0
INFO [01-16|11:00:32] Loaded most recent local fast block number=0 hash=bf2891…ad1419 td=33554432
Trie cache unloads: 0
INFO [01-16|11:00:32] Importing blockchain file=/home/yujian/eth-block.txt
Object memory: 34.677 MB current, 34.670 MB peak
System memory: 74.100 MB current, 73.850 MB peak
Allocations: 0.015 million
GC pause: 10.454997ms
Compacting entire database...
INFO [01-16|11:00:33] Database closed database=/home/yujian/.ethereum/geth/chaindata
Compaction done in 64.422235ms.
Compactions
Level | Tables | Size(MB) | Time(sec) | Read(MB) | Write(MB)
-------+------------+---------------+---------------+---------------+---------------
0 | 0 | 0.00000 | 0.00451 | 0.00000 | 0.00021
1 | 1 | 0.00053 | 0.00435 | 0.00114 | 0.00053
```
* __export__
```
function:导出区块数据到指定的文件
args:<filename> [<blockNumFirst> <blockNumLast>]
demo: export /home/yujian/eth-block.txt
notice:
success_result_demo:
WARN [01-16|10:51:36] No etherbase set and no accounts found as default
INFO [01-16|10:51:36] Allocated cache and file handles database=/home/yujian/.ethereum/geth/chaindata cache=128 handles=1024
INFO [01-16|10:51:36] Disk storage enabled for ethash caches dir=/home/yujian/.ethereum/geth/ethash count=3
INFO [01-16|10:51:36] Disk storage enabled for ethash DAGs dir=/home/yujian/.ethash count=2
Export done in 628.951µsINFO [01-16|10:51:36] Loaded most recent local header number=0 hash=bf2891…ad1419 td=33554432
INFO [01-16|10:51:36] Loaded most recent local full block number=0 hash=bf2891…ad1419 td=33554432
INFO [01-16|10:51:36] Loaded most recent local fast block number=0 hash=bf2891…ad1419 td=33554432
INFO [01-16|10:51:36] Exporting blockchain file=/home/yujian/eth-block.txt
INFO [01-16|10:51:36] Exporting batch of blocks count=1
INFO [01-16|10:51:36] Exported blockchain file=/home/yujian/eth-block.txt
```
* __copydb__
```
function:从存在的链数据文件夹中创建一条本地链
args:<sourceChaindataDir>
demo: copydb /home/yujian/eth-block.txt
notice:
success_result_demo:
WARN [01-16|11:35:55] No etherbase set and no accounts found as default
INFO [01-16|11:35:55] Allocated cache and file handles database=/home/yujian/.ethereum/geth/chaindata cache=128 handles=1024
INFO [01-16|11:35:55] Disk storage enabled for ethash caches dir=/home/yujian/.ethereum/geth/ethash count=3
INFO [01-16|11:35:55] Disk storage enabled for ethash DAGs dir=/home/yujian/.ethash count=2
INFO [01-16|11:35:55] Loaded most recent local header number=0 hash=bf2891…ad1419 td=33554432
INFO [01-16|11:35:55] Loaded most recent local full block number=0 hash=bf2891…ad1419 td=33554432
INFO [01-16|11:35:55] Loaded most recent local fast block number=0 hash=bf2891…ad1419 td=33554432
INFO [01-16|11:35:55] Allocated cache and file handles database=/home/yujian/eth-go/geth/chaindata cache=128 handles=256
INFO [01-16|11:35:55] Block synchronisation started
INFO [01-16|11:35:55] Imported new state entries count=1 elapsed=33.277µs processed=1 pending=0 retry=0 duplicate=0 unexpected=0
INFO [01-16|11:35:56] Imported new block headers count=11 elapsed=1.276s number=11 hash=ec3374…59a2ba ignored=0
Database copy done in 1.280940454s
Compacting entire database...
INFO [01-16|11:35:56] Imported new chain segment blocks=11 txs=0 mgas=0.000 elapsed=1.961ms mgasps=0.000 number=11 hash=ec3374…59a2ba
Compaction done in 11.130389ms.
```
因字数原因更多内容请见：http://bbs.itxdl.cn/read-htm-tid-242247-page-1.html
