Things in the /etc/inittab are automatically respawned when they fail. That's its main job.
Your script closes the file between the stty and the read loop. You are counting on the settings being persistent. That's why I used the exec in my last example. Alternately, the last "done" could be "done </dev/ttyUSB0", and take out the other input redirections. What you want is a single program entity that's operating on the intended device. I think your 10-second retry would work, but be sure that the USB device doesn't end up as your controlling terminal, giving your script a SIGHUP when it's disconnected. You need to read up on the TTY driver, a ^D will likely also end the read loop. -- Jim -----Original Message----- From: Michael Hagedorn [mailto:[email protected]] Sent: Thursday, March 25, 2010 2:00 PM To: [email protected] Cc: Cathey, Jim; Michael Abbott; [email protected] Subject: Re: Logging serial port data to file Thanks a lot for your input, I will try them tonight and report back which one works the best. Another thing is that if somebody pulls out the usb 2 serial adapter the script fails and exits. I want it to continue or restart if the device has been put back. I have come up with this (but haven't tried it yet): while true; do # Make sure the boudrate is set correctly stty -F /dev/ttyUSB0 57600 while read -r; do echo "[$(date)]: $REPLY" done </dev/ttyUSB0 >>/usb/BigDrive/CurrentCost/CurrentCost.log # Try again in 10 seconds sleep 10 done Rather than trying to read from /dev/ttyUSB0 is there a way to check whether it is connected? Regards On 26 March 2010 06:34, Doug Clapp <[email protected]> wrote: > > > Cathey, Jim wrote: >>> >>> Is there an easy way to disregard lines that contain only control >>> characters or filter the text? >>> >> >> Not trivially. As you've been shown, "tr -d" is your >> buddy. > > Another possibility is to pipe through dos2unix (rather than tr) to remove > the CR characters. Ultimately you have to decide which method works best for > you. > > Doug Clapp _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
