Bash 脚本：将流从串行端口 (/dev/ttyUSB0) 保存到文件，直到出现特定输入（例如 eof）
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Bash script: save stream from Serial Port (/dev/ttyUSB0) to file until a specific input (e.g. eof) appears
提问by user1822048
I need a bash script to read the data stream from a Serial Port (RS232 to USB adapter - Port: /dev/ttyUSB0). The data should be stored line by line in a file until a specific input (for example "eof") appears. I can give any external input to the Serial Port. Till now I use cat to read the data, which works fine.
我需要一个 bash 脚本来从串行端口（RS232 到 USB 适配器 - 端口：/dev/ttyUSB0）读取数据流。数据应逐行存储在文件中，直到出现特定输入（例如“eof”）。我可以为串行端口提供任何外部输入。到目前为止，我使用 cat 读取数据，效果很好。
cat /dev/ttyUSB0 -> file.txt
The problem is, that I need to finish the command myself by entering cntr+C, but I don't know exactly when the data stream ends and the ttyUSB0 file does not gerenate an EOF. I tried to implement this myself, but did not find a convenient solution. The following command works, but I don't know how to use it for my problem ("world" will create a "command not found" error):
问题是，我需要通过输入 cntr+C 自己完成命令，但我不知道数据流何时结束并且 ttyUSB0 文件不会生成 EOF。我试图自己实现这一点，但没有找到方便的解决方案。以下命令有效，但我不知道如何将其用于我的问题（“world”将创建“command not found”错误）：
#!/bin/bash
cat > file.txt << EOF
hello
EOF
world
The following code works for my problem, but it takes too much time (the data stream consists of ~2 million lines):
以下代码适用于我的问题，但需要太多时间（数据流包含约 200 万行）：
#!/bin/bash
while read line; do
if [ "$line" != "EOF" ]; then
echo "$line" >> file.txt
else
break
fi
done < /dev/ttyUSB0
Has anyone a convenient possibility for my problem?
有没有人为我的问题提供方便的可能性？
采纳答案by Aaron Digulla
Try awk(1):
尝试awk(1)：
awk `
/EOF/ {exit;}
{print;}` < /dev/ttyUSB0 > file.txt
This stops when it sees the line EOFand prints everything else to file.txt
当它看到该行EOF并将其他所有内容打印到file.txt
