兄弟连区块链教程以太源码分析CMD深入分析（二）

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　　兄弟连区块链教程以太源码分析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

```

因字数原因更多内容请见：http://bbs.itxdl.cn/read-htm-tid-242247-page-1.html