如何将picocom连接ThreadX嵌入式系统的输出日志保存至文件？

Absolutely, there are several reliable, hands-off ways to capture all terminal output from your ThreadX-based embedded device (connected via picocom) without manual copy-pasting. Here are my go-to methods for embedded systems work:

1. Use Picocom's Built-in Logging Feature #

Picocom has native support for logging all session output directly to a file, which is the most straightforward option for this use case.

• Start picocom with logging enabled:

  sudo picocom -b 115200 --log threadx_device_logs.txt /dev/ttyUSB0
  

  This command will write every line of output (both your input commands and the device's ThreadX logs) to threadx_device_logs.txt in real time.

• Append to an existing log file:
  If you don't want to overwrite a previous log, use the --append flag:

  sudo picocom -b 115200 --log threadx_device_logs.txt --append /dev/ttyUSB0
  

2. Shell Redirection or tee Command #

If you prefer using shell utilities instead of picocom's built-in tools, you can leverage output redirection:

• Redirect all output to a file (no terminal preview):

  sudo picocom -b 115200 /dev/ttyUSB0 > threadx_logs.txt 2>&1
  

  The > redirects standard output to the file, while 2>&1 ensures error messages (if any) are also captured.

• Preview output and save to file simultaneously:
  Use tee to view logs in your terminal while saving them to a file:

  sudo picocom -b 115200 /dev/ttyUSB0 | tee threadx_logs.txt
  

  To append to an existing file instead of overwriting it, add the -a flag to tee:

  sudo picocom -b 115200 /dev/ttyUSB0 | tee -a threadx_logs.txt
  

3. Enable Logging Mid-Session (No Restart Needed) #

If you're already connected to the device and don't want to terminate the picocom session, you can toggle logging on the fly using picocom's shortcut keys:

1. Press Ctrl+a (this is picocom's command prefix).
2. Press l (lowercase L) to trigger the logging prompt.
3. Enter the filename you want to save logs to, then press Enter.
4. To stop logging later, repeat the same Ctrl+a + l sequence.

Quick Tip #

Since you're using sudo, the generated log files will be owned by the root user. To make them accessible for your regular user account, run:

sudo chown your_username:your_username threadx_device_logs.txt

内容的提问来源于stack exchange，提问作者YounLee