[SOLVED] Picocom command no longer works after detach

Issue

I am attempting to log UART data from my USB port to an output file. The following command works.

picocom /dev/ttyUSB0 -b 115200 | ts '[%Y-%m-%d %H:%M:%S]' >> ~/output.log

However, once I attempt to detach from this process,

picocom /dev/ttyUSB0 -b 115200 | ts '[%Y-%m-%d %H:%M:%S]' >> ~/output.log &

the command no longer works.

How can I detach from this process and let my logger run in the background?

Solution

You could use something like tmux, screen, or dtach. For example, using dtach:

dtach -n /tmp/serial sh -c 'picocom -b 115200 /dev/ttyUSB0 > output.log'

This will start picocom detached from the terminal; it will happily continue running until you re-attach to it and exit:

dtach -a /tmp/serial

---

You can do the same thing with tmux:

tmux new-session -s serial -d 'picocom -b 115200 /dev/ttyUSB0 > output.log'

You can then re-attach to that session...

tmux attach -t serial

...and exit picocom.

Answered By - larsks

Answer Checked By - Timothy Miller (WPSolving Admin)