diff --git a/geth-install.sh b/geth-install.sh
new file mode 100644
index 0000000..baef2c6
--- /dev/null
+++ b/geth-install.sh
@@ -0,0 +1,54 @@
+#!/bin/bash
+
+defaultVERSION=1.10.26
+
+if [ $1 ]
+then
+  VERSION=$1
+else
+  echo "=== Enter geth <VERSION> or <leave blank> for default $defaultVERSION" 
+  read -p ">>> " VERSION
+  if [ ! "$VERSION" ]
+  then
+    VERSION=$defaultVERSION
+    echo Use default version $defaultVERSION
+  fi
+fi
+
+
+echo "=== Install geth：[b] for 二进制， [s] for 源代码，[anything else or leave blank] for no change"
+read -p ">>> " BINARY_OR_SOURCE
+if [ "$BINARY_OR_SOURCE" == 'b' ]
+then
+  echo "--- 下载二进制 geth (https://geth.ethereum.org/downloads)"
+  # mkdir -p ./geth-temp/
+  # cd ./geth-temp
+  if [ "$VERSION" == '1.10.26' ]
+  then
+    wget https://gethstore.blob.core.windows.net/builds/geth-linux-amd64-1.10.26-e5eb32ac.tar.gz -O geth-linux-amd64-$VERSION.tgz
+  elif [ "$VERSION" == '1.10.25' ]
+  then
+    wget https://gethstore.blob.core.windows.net/builds/geth-linux-amd64-1.10.25-69568c55.tar.gz -O geth-linux-amd64-$VERSION.tgz
+  else
+    echo "=== please find the download link in https://geth.ethereum.org/downloads"
+    read -p ">>> " DOWNLINK
+    wget $DOWNLINK -O geth-linux-amd64-$VERSION.tgz
+  fi
+  tar xzf ./geth-linux-amd64-$VERSION.tgz # --strip-components 1 ## 去掉tar包中顶级目录，因为顶级目录含有checksum，不方便在下一步进入
+  echo "--- 安装到 /usr/local/bin/geth"
+  mv ./geth-linux-amd64-*/geth /usr/local/bin/
+  # echo "--- 删除原始文件"
+  # cd ..
+  # rm -fr ./geth-temp
+elif [ "$BINARY_OR_SOURCE" == 's' ]
+then
+  echo "--- 克隆并编译 geth"
+  git clone -b v$VERSION https://github.com/ethereum/go-ethereum ./geth-temp/go-ethereum
+  mkdir -p ./geth-temp/
+  pushd ./geth-temp/go-ethereum && make geth && popd # 或者 make all
+  mv ./geth-temp/go-ethereum/build/bin/geth /usr/local/bin/
+  rm -fr ./geth-temp/
+else
+  echo "--- Nothing changed."
+fi
+echo ""
diff --git a/geth-prepare.sh b/geth-prepare.sh
new file mode 100644
index 0000000..8b1bedc
--- /dev/null
+++ b/geth-prepare.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+
+echo "=== Set [datadir] name, leave [blank] for default 'pex-data-poa'（可以尚未存在）:"
+read -p ">>> " DATADIR
+if [ ! "$DATADIR" ]
+then
+  DATADIR=chain-poa
+fi
+echo "*** DATADIR === $DATADIR "
+echo ""
+
+echo "=== Init accounts: [y] for yes, [anything else] for no change"
+read -p ">>> " INIT_ACCOUNTS
+if [ $INIT_ACCOUNTS ] && [ $INIT_ACCOUNTS == 'y' ]
+then
+  echo "--- 生成新账户，自动存放在 ./$DATADIR/keystore/"
+  geth --datadir ./$DATADIR/ account list # 检查现有账户。如果 ./pex-data/ 已经有数据，就不用生成新账户
+  # 生成 [datadir]/keystore/ 下的钱包文件。密码都设为 123
+  geth --datadir ./$DATADIR/ account new # 0x3831e121b349aebaea8ed0c44d4c7cb7b15ad8ad 导入 MetaMask 可得私钥 0xd2ed4496be1251a7f55772bba6ef1106ec330e27002898a5e1c69cd4e39de965 用在 hardhat.config.js 的 network 定义里
+  geth --datadir ./$DATADIR/ account new # 0x921b248a470f7d0bba40077c7aee3ab3440caa77 导入 MetaMask 可得私钥 0x155d0d6fb836244be84e12fb7d79c1ae8d4b398f045f9e1a4cfdfef6f21b8a8e
+  echo "--- 请编写创世区块 genesis-$DATADIR.json ，设置新账户的初始金额 （PoW 的私有链挖矿比较容易，所以实际上不需要预置有币的账号，需要的时候自己挖矿获币也可以）"
+else
+  echo "--- Nothing changed."
+fi
+echo ""
+
+echo "=== Init chain from genesis-$DATADIR.json: [y] for yes, [anything else] for no change"
+read -p ">>> " INIT_CHAIN
+if [ $INIT_CHAIN ] && [ $INIT_CHAIN == 'y' ]
+then
+  echo "--- 初始化链上数据，存放在 ./$DATADIR/geth/"
+  geth --datadir ./$DATADIR/ init ./genesis-$DATADIR.json
+else
+  echo "--- Nothing changed."
+fi
+echo ""
diff --git a/geth-run.sh b/geth-run.sh
new file mode 100644
index 0000000..bfffb94
--- /dev/null
+++ b/geth-run.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+
+DATADIR=$1
+
+while [ ! "$DATADIR" ] || [ ! -d "./$DATADIR" ]
+do
+  echo "=== Set [datadir] name, leave [blank] for default 'pex-data-poa'"
+  read -p ">>> " DATADIR
+  if [ ! "$DATADIR" ]
+  then
+    DATADIR=chain-poa
+  fi
+done
+echo ""
+
+
+echo "Run geth in pm2? [y] for yes, [anything else] for raw geth:"
+read -p ">>> " RUNPM2
+echo "--- Creating ./$DATADIR/geth.ipc ..."
+# http.addr 默认为 127.0.0.1 => 无法从远处连接。要用 0.0.0.0 才能从远处用 IP 连接。
+# shh 是 whisper 协议，好像要先启动 websocket 接口才能启用。
+# 我的 PEX 链的默认端口：
+# - pex=739
+# - chainid 6739
+# - networkid 6739
+# - rpc 端口/http.port 6739
+# - 网络端口/port 60739
+
+while [ ! "$KEYCODE" ]
+do
+  echo "=== Define chain keycode, for instance '739' for pexchain:"
+  read -p ">>> " KEYCODE
+done
+
+if [ "$RUNPM2" == 'y' ]
+then
+  pm2 start -x 'geth' --name $DATADIR -- --datadir ./$DATADIR/ --http --http.addr 0.0.0.0 --http.port 6$KEYCODE --http.api eth,net,web3,personal,admin,miner,debug,txpool,shh --http.corsdomain "*" --nodiscover --networkid 6$KEYCODE --port 60$KEYCODE --allow-insecure-unlock  -unlock '0xbC0ab80eef0A86eF248993D3f59B73F142278fbc' --password ./keystore-password.txt --mine --miner.threads 1
+else
+  # 如果不是用 pm2 而是直接用 geth，那么可以在最后加 console。不提供password也可以，那就会在命令行提示输入。
+  geth --datadir ./$DATADIR/ --http --http.addr 0.0.0.0 --http.port 6$KEYCODE --http.api eth,net,web3,personal,admin,miner,debug,txpool --http.corsdomain "*" --nodiscover --networkid 6$KEYCODE --port 60$KEYCODE --allow-insecure-unlock  -unlock '0xbC0ab80eef0A86eF248993D3f59B73F142278fbc' --password ./keystore-password.txt --mine --miner.threads 1 console
+fi
diff --git a/ipfs-install.sh b/ipfs-install.sh
index 5b7ace3..7668093 100755
--- a/ipfs-install.sh
+++ b/ipfs-install.sh
@@ -1,4 +1,4 @@
-defaultVERSION=0.17.0
+defaultVERSION=0.18.1
 
 if [ $1 ]
 then
diff --git a/nixhome/.bashrc b/nixhome/.bashrc
index 12c0713..dc5377e 100644
--- a/nixhome/.bashrc
+++ b/nixhome/.bashrc
@@ -58,6 +58,7 @@ then
   alias ll='ls -lGA' # show .xxx 
   alias dir='ls -lGA'
   alias lll='ls -lGa' # show .xxx and . and ..
+  alias sedi='sed -i ""'
   export HOMEBREW_NO_AUTO_UPDATE=true
   export BASH_SILENCE_DEPRECATION_WARNING=1
 else
@@ -65,6 +66,7 @@ else
   alias ll='ls -lA --color=auto'
   alias dir='ls -lA --color=auto'
   alias lll='ls -la --color=auto'
+  alias sedi='sed -i'
   export TIME_STYLE='+%Y-%m-%d--%H:%M:%S' 
 fi
 #export LS_OPTIONS='--color=auto' # 如果没有指定，则自动选择颜色