bash 命令从网络套接字读取？

bash command to read from network socket?

提问by Jen S.

I am looking for a simple bash command to open a client socket, read everything from the socket, and then close the socket. Something like wget or curl for sockets.

我正在寻找一个简单的 bash 命令来打开客户端套接字，从套接字读取所有内容，然后关闭套接字。像套接字的 wget 或 curl 之类的东西。

Is there a command in Bash to do this? Of do I need to write a bash script?

Bash 中是否有执行此操作的命令？我需要写一个 bash 脚本吗？

采纳答案by Ignacio Vazquez-Abrams

Netcatis the tool usually used to do this, but it can also be done with the /dev/tcpand /dev/udpspecial pathnames.

Netcat是通常用于执行此操作的工具，但也可以使用/dev/tcp和/dev/udp特殊路径名来完成。

回答by Cipi

Use nc. Its quick and easy. To connect to client 192.168.0.2 on port 999, send it a request for a resource, and save that resource to disk, do the following:

使用 nc。它快速简便。要在端口 999 上连接到客户端 192.168.0.2，向其发送对资源的请求，并将该资源保存到磁盘，请执行以下操作：

echo "GET /files/a_file.mp3 HTTP/1.0" | nc -w 5 192.168.0.2 999 > /tmp/the_file.mp3

echo "GET /files/a_file.mp3 HTTP/1.0" | nc -w 5 192.168.0.2 999 > /tmp/the_file.mp3

Switch -w 5states that nc will wait 5 seconds max for a response. When nc is done downloading, the socket is closed.

Switch-w 5声明 nc 最多等待 5 秒以获得响应。当 nc 完成下载时，套接字关闭。

If you want to send a more complex request, you can use gedit or some other text editor to write it, save it to file "reqest", and then cat that file through the pipe to nc:

如果你想发送一个更复杂的请求，你可以使用 gedit 或其他一些文本编辑器来编写它，将它保存到文件“reqest”，然后通过管道将该文件 cat 到 nc：

cat request.txt | nc -w 5 192.168.0.2 999 > /tmp/the_file.mp3

cat request.txt | nc -w 5 192.168.0.2 999 > /tmp/the_file.mp3

You don't need write a script for this, because it is a one line command... But if you will use it often, writing a script is a must!

你不需要为此编写脚本，因为它是一个单行命令......但如果你经常使用它，那么编写脚本是必须的！

Hope I helped. :)

希望我有所帮助。:)

回答by tokland

The already mentioned netcat(nc) is simple and powerful. But if you need a yet more powerful tool: socat.

已经提到的netcat( nc)简单而强大。但是，如果您需要一个更强大的工具：socat。