======版本升级======
<code bash>
wget https://github.com/Bitcoin-ABC/bitcoin-abc/releases/download/v0.18.4/bitcoin-abc-0.18.4-x86_64-linux-gnu.tar.gz
tar -zxvf bitcoin-abc-0.18.4-x86_64-linux-gnu.tar.gz
sudo nohup /app/bch0.18.4/bitcoin-abc-0.18.4/bin/bitcoind -conf=/app/.bitcoin/bitcoinabcmainnet.conf -datadir=/app/.bitcoinabcmainnet

备份私钥：
sudo /app/bitcoin-abc/src/bitcoin-cli -conf="/app/.bitcoin/bitcashmainnet.conf" dumpwallet ./wallet.txt
备份钱包文件：
sudo mv /app/.bitcoinabcmainnet/wallet.dat /app/.bitcoinabcmainnet/wallet.dat.bak
sudo mv /app/.bitcashmainnet/wallet.dat /app/.bitcashmainnet/wallet.dat.bak


查看如下日志，发现报错是因为DB版本引起的，尝试升级DB版本
sudo vi /app/.bitcashmainnet/db.log
wallet.dat: BDB0090 DB_VERIFY_BAD: Database verification failed
BDB1009 /app/.bitcashmainnet/wallet.dat: unsupported btree version: 10
BDB0526 Page 0: unsupported DB version 10; extraneous errors may result
BDB0547 Page 0: unsupported database version 10; extraneous errors may result
BDB0547 Page 2: unsupported database version 10; extraneous errors may result
以下是节点备用机的升级方案：
sudo mv /usr/lib64/libdb-5.3.so /usr/lib64/libdb-5.3.so.bak
sudo mv /usr/lib64/libdb-5.so /usr/lib64/libdb-5.so.bak
sudo cp /usr/local/lib/libdb-6.2.a /usr/lib64/libdb-6.2.a
sudo cp /usr/local/lib/libdb.a /usr/lib64/libdb.a
sudo cp /usr/local/lib/libdb_cxx-6.2.a /usr/lib64/libdb_cxx-6.2.a
sudo cp /usr/local/lib/libdb_cxx.a /usr/lib64/libdb_cxx.a

结论：
以上操作都无效，开始用新版本客户端重新同步数据
sudo nohup sudo /app/bch_0.18.4/bitcoin-abc-0.18.4/bin/bitcoind -conf="/app/.bitcoin/bitcashmainnet.conf" -datadir="/app/.bitcashabcmainnet" &

同步完毕后，将私钥导入到新钱包
sudo /app/bch_0.18.4/bitcoin-abc-0.18.4/bin/bitcoin-cli -conf=/app/.bitcoin/bitcashmainnet.conf importwallet /app/script_coin/bch/wallet.txt
</code>
=====分割线=====
    $mkdir /app

    $git clone https://github.com/Bitcoin-ABC/bitcoin-abc.git

    或直接下载最新源代码：

    $wget https://github.com/Bitcoin-ABC/bitcoin-abc/archive/master.zip

    $cd /app/bitcoin-abc

download the berkeley-db

http://download.oracle.com/otn/berkeley-db/db-6.2.32.NC.tar.gz

upzip the package
<code bash>
    $tar -xf db-6.2.32.NC.tar.gz

    $cd db-6.2.32.NC/build_unix/

    $sudo ../dist/configure -enable-cxx -disable-shared --prefix=/usr/local

    $sudo make install
</code>
build the bitcoin-abc
<code bash>
    $cd /app/bitcoin-abc

    $sudo sh autogen.sh

    $sudo ./configure  --with-gui=no --disable-tests --prefix=/usr/local/bitcoin-bch

    $sudo make
</code>
这里如果报错，就需要升级gcc版本。
    报错信息：
    ./amount.h:123:73: error: can't initialize friend function 'operator*'
    friend constexpr Amount operator*(const double a, const Amount b) = delete;
     
    GCC升级
    # yum install centos-release-scl -y
    # yum install devtoolset-4-toolchain -y
    # scl enable devtoolset-4 bash
    # gcc --version
    
    如果编译还是出上面的错，就执行
    scl enable devtoolset-4 bash

如下报错信息，需要升级Boost版本。https://github.com/Bitcoin-ABC/bitcoin-abc/pull/124

    test/cashaddrenc_tests.cpp:196:29: error: no match for ‘operator!=’ (operand types are ‘CTxDestination {aka boost::variant<CNoDestination, CKeyID, CScriptID>}’ and ‘const CTxDestination {aka const boost::variant<CNoDestination, CKeyID, CScriptID>}’)
    http://www.boost.org   下载最新版本boost
    tar -xf boost.tar.gz
    cd boost_1_67
    sudo ./bootstrap.sh --prefix=/usr/local/include/boost
    sudo ./b2 --build-type=complete --layout=tagged install
    
    编译boost报错：
    
    找到如下文件：
    /app/boost_1_67_0/tools/build/src/tools/python.jam
    
    修改如下：
    includes ?= $(prefix)/include/python$(version) ;  错误
    
    includes ?= $(prefix)/include/python$(version)m ;  正确
    
    打开：
    ./bootstrap.sh
    
    修改：PYTHON=python 为 PYTHON=python3
    
    编译完毕后配置路径
    $ sudo mv /usr/include/boost/ /usr/include/boost.backup
    $ sudo mv /usr/lib64/libboost_* /usr/lib64/boost.backup/
    
    $ sudo mv /usr/local/include/boost/include/boost/ /usr/include/
    $ sudo mv /usr/local/include/boost/lib/libboost_* /usr/lib64/
    


$sudo make install

会报一堆告警信息，但是不用理会，最终运行echo $?，看一眼有没有报错即可，如果显示0，就是没报错

安装完毕后，会在/usr/local/bitcoin-bch目录下，分别是比特币现金的运行文件和测试文件，这里，我们运行测试文件test_bitcoin，来测试安装是否完整（吐槽：bitcoin-abc真是操蛋，编译出来的运行文件居然和比特币命名和路径完全一样，把我机器上比特币的运行文件覆盖掉了！重编了一遍比特币！！配置工程的时候一定指定--prefix参数！！！）

    $cd /usr/local/bitcoin-bch
    $./test_bitcoin
    
    
比特现金BCH测试网络测试币获取：

https://testnet.manu.backend.hamburg/bitcoin-cash-faucet

查看BCH测试网络交易：

https://www.blocktrail.com/tBCC/tx/79c77fbbf364c055a86681d0336b3dd07cb96d3954da8936086f8aba89bd53fc