bash脚本:从串行端口(的/ dev / ttyUSB0)保存流文件,直到特定输入(例如EOF)出现 [英] Bash script: save stream from Serial Port (/dev/ttyUSB0) to file until a specific input (e.g. eof) appears
问题描述
我需要一个bash脚本从串口数据流中读取(RS232转USB适配器 - 端口是:/ dev / ttyUSB0)。该数据应存储逐行在一个文件中,直到一个特定的输入(例如,EOF)出现。我可以给任何外部输入到串行端口。
直到现在我用猫来读取数据,工作正常。
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.
cat /dev/ttyUSB0 -> file.txt
问题是,我需要通过输入可逆计数器+ C来完成命令自己,但我不知道什么时候数据流结束,ttyUSB0文件不gerenate一个EOF。我想这个实施自己,但没有找到一个方便的解决方案。
下面的命令工作,但我不知道如何使用它我的问题(世界将创造一个错误找不到命令):
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):
#!/bin/bash
cat > file.txt << EOF
hello
EOF
world
以下code适用于我的问题,但它需要太多的时间(数据流由〜2万行):
The following code works for my problem, but it takes too much time (the data stream consists of ~2 million lines):
#!/bin/bash
while read line; do
if [ "$line" != "EOF" ]; then
echo "$line" >> file.txt
else
break
fi
done < /dev/ttyUSB0
有没有人对我的问题的可能性方便?
Has anyone a convenient possibility for my problem?
推荐答案
尝试 AWK(1)
:
awk `
/EOF/ {exit;}
{print;}` < /dev/ttyUSB0 > file.txt
这将停止时,看到该行 EOF
并打印其他一切 file.txt的
This stops when it sees the line EOF
and prints everything else to file.txt
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