this post was submitted on 01 Jan 2024
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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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:
your cmd | tee >(grep 'denied' > error.log)
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, sogrep
receives every line, and writes the denied lines to a log file which you display withtail
in the other pane.Rather than using a file for error.log you could also use a named pipe in much the same way.
Thanks! I'm curious if there is a way to do this as a one-liner?
Sorry for th slow answer, I've been away. There is a way, if it's still useful to you:
First, create a named fifo, you only need to do this once:
Run your rsync in one pane, with a filtered view in the second:
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.Thanks!