3
I am trying write a script which connects and runs command on /dev/ttyUSB0 after that gets the output.
screen -d -m 'SCREEN COMMAND' -L /dev/ttyUSB0
But this does not create an output file. How can I solve this issue? Any ideas?
denizeren
Posted 2012-12-03T08:05:59.390
Reputation: 143
1
Try pyserial library of python. I think you can solve it with this library. You can find a tutorial in here
0xmtn
Posted 2012-12-03T08:05:59.390
Reputation: 140
0
screen is good to have your terminal session to run detached. However, it was not designed to automatically run commands on terminals.
For this purpose, another tool was developed - expect.
expect allows to script human-like interaction with programs running on terminal.
It is powerful tool, but it is also another scripting language to learn and can be a bit tedious. If you are familiar with Perl, Perl Expect module can save you a lot of effort (there are also expect modules for other scripting languages like Python).
One more note. In your case, it seems that /dev/ttyUSB0 is serial-over-USB device that may connect or disconnect at any time. If you want to automatically maintain interaction to this serial-over-USB interface, you may consider either watching for this device to appear/disappear and reconnect automatically (say in Perl script), or add udev rule (under /etc/udev/rules.d) which will automatically start your handler program as new USB device is connected.
mvp
Posted 2012-12-03T08:05:59.390
Reputation: 3 705
1@mtndesign In the future, please check the code formatting, you also have to remove the `backticks`. Thanks. – slhck – 2012-12-03T08:31:57.007