Tmux is a very helpful terminal multiplexer, meaning it can split your terminal into multiple panes. So, create two side by side panes, then one way of doing it is:
on the left, run your cmd | tee >(grep ‘denied’ > error.log)
on the right, run tail -f error.log
The tee process takes it’s standard in, and writes itbto both standard out, so you see all the lines, and the path it’s been given. The >(…) operator runs the grep in a subprocess, and returns the path to it’s standard input pipe, so grep receives every line, and writes the denied lines to a log file which you display with tail in the other pane.
Rather than using a file for error.log you could also use a named pipe in much the same way.
I’m not an expert, but there’s a good overview of the process here: Nat Geo. You can de-paywall it at the usual places. They describe it more as “an organised broth full of chunky bits” as some organs don’t break down.
All of the little provocations throughout this thread have been enough to make me twich, but this is the one that pushed me over the edge. I’m this close to printing out your comment just so I can correct it!
I can see certain benefits, but as the parent poster mentions, what happens if there’s a child on the car, or, indeed, you’ve left something else important in it when it drives off. Surely it’s better for it just not to start, and keep a human in the loop for returning it.
Aaarrgghh! I was just calming down, and now the twitching is back! Nurse! Nurse! I need my dried frog pills, someone is doing terrible things to the English language online.
I second the recommendation, it’s a great story. The writing isn’t perfect, but it’s absorbing and there’s plenty of good world building and characters.
Oh, I’m sure that, once word gets out, everyone will have a few Snickers or similar treats to hand at all times, sort of like how spirits would be sent to the afterlife with two coins for Charon, but a bit earlier in the process.
The sound waves are focused onto the tumor, so they only have enough energy to damage tissue there, and not anywhere else.
Think about focusing the sun’s rays through a magnifying glass; they’re only concentrated enough to burn at a very small area. The focused ultrasound is similar, although they’re probably using some form of phased array to get the equivalent effect.
That’s fair, but the result seems to be the same; he’s nowhere near as caustic when interacting with people as he used to be. I had quite a lot of sympathy with the message in most of his technical rants, but the delivery was counterproductive. If he’s changed that I think he’s done well.
Run your rsync in one pane, with a filtered view in the second:
<span style="color:#323232;">tmux new 'rsync ...options... |& tee logview' ; split-window -h 'grep "denied" logview'
</span>
Replace …options… with your normal rsync command line.
That should give you a split view, with all the normal messages on the left, and only messages containing ‘denied’ on the right.
The |& makes sure we capture both stdout and stderr, tee then writes them to the fifo and displays them. split-window tells tmux to create a second pane, and display the output of grep.
As with so many problems, this one can be solved with a suitably large cannon. Why you’d want to fire cups of water into the stratosphere is left as an exercise for the interested reader.