How do i tail dmesg

Since tail -n doesn't account for that but rather counts logical lines regardless of their length, it can deliver more lines on screen than asked for, and watch displays only the first screenfull of them, losing the rest 4 in your test case. To remedy that, you can wrap the dmesg lines to fit in the screen width before feeding them to tail -n , for example:. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Following the output of the dmesg command Ask Question. Asked 6 years, 2 months ago. Active 1 year, 10 months ago.

Viewed 4k times. Thank you. Improve this question. Community Bot 1 1 1 silver badge. LZh LZh 53 2 2 silver badges 8 8 bronze badges. I'm seeing its working. Please leave a comment to start the discussion. Please keep in mind that all comments are moderated and your email address will NOT be published. Save my name, email, and website in this browser for the next time I comment. Notify me of followup comments via e-mail. You can also subscribe without commenting. This site uses Akismet to reduce spam.

Learn how your comment data is processed. Read Also : 10 Linux Commands to Collect System and Hardware Information dmesg Command Examples The messages are very important in terms of diagnosing purpose in case of device failure. List all loaded Drivers in Kernel We can use text-manipulation tools i. If you liked this article, then do subscribe to email alerts for Linux tutorials.

If you have any questions or doubts? Related Posts. The whole article looks weird. Thus it won't really change between invocations of dmesg. One would need to use a wrapper that would query the terminal state. That's the whole point. The single quotes prohibit the variable expansion when the shell passes the arguments to watch , therefore watch will execute the command with the variable expression in there, which will be expanded by the shell it invokes.

Each time. Try it, it works. Hmm, you are right - I assume watch uses popen , which means another shell is spawned and the environment variable is then supplied by it and thus updated on every execute run. Nice find. The only option for macOS at this point as it the provided dmseg does not implement the -w flag.

You can't really monitor the output of dmesg directly. Peter Mortensen 1, 1 1 gold badge 8 8 silver badges 10 10 bronze badges. Granted, some other stuff goes there too though. You use dmesg to get log messages of the kernel. Really useful for debugging android. On systems that use systemd you can also: journalctl -kf. Maxim Maxim 4 4 silver badges 6 6 bronze badges.

Ubuntu And the second command just watches that test. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming