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Free•BSD-2-Clause
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把命令行的输出 stdout 和 stderr 重定向为一个 websocket 服务的工具。运行步骤如下：
1. 安装命令：`brew install websocketd`
2. 创建 count.sh 内容如下
3. 运行 count.sh，命令：`./count.sh`
4. 启动一个 websocket server，命令：`websocketd --port=8080 ./count.sh`
5. 创建 html 文件，代码如下
6. 点击打开 count.html 文件，查看效果
```
count.sh 文件内容如下
#!/bin/bash
for ((COUNT = 1; COUNT <= 3; COUNT++)); do
echo $COUNT
sleep 1
done
count.html 文件内容如下
<!DOCTYPE html>
<pre id="log"></pre>
<script>
// helper function: log message to screen
function log(msg) {
document.getElementById('log').textContent += msg + '\n';
}
// setup websocket with callbacks
var ws = new WebSocket('ws://localhost:8080/');
ws.onopen = function() {
log('CONNECT');
};
ws.onclose = function() {
log('DISCONNECT');
};
ws.onmessage = function(event) {
log('MESSAGE: ' + event.data);
};
</script>
```
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