New features:
- --decode facility and level number to human readable prefixes
$ dmesg --decode
kern :info : [26443.677632] ata1.00: configured for UDMA/100
kern :info : [26443.830225] PM: resume of devices complete after 2452.856 msecs
kern :debug : [26443.830606] PM: Finishing wakeup.
kern :warn : [26443.830608] Restarting tasks ... done.
- filter out messages according to the --facility and --level options, for example
$ dmesg --level=err,warn
$ dmesg --facility=daemon,user
$ dmesg --facility=daemon --level=debug
- -u, --userspace to print only userspace messages
- -k, --kernel to print only kernel messages
- -t, --notime to skip [...] timestamps
- -T, --ctime to print human readable timestamp in ctime()-like format. Unfortunately, this is useless on laptops if you have used suspend/resume. (The kernel does not use the standard system time as a source for printk() and it's not updated after resume.)
- --show-delta to print time delta between printed messages
$ dmesg --show-delta
[35523.876281 < 4.016887>] usb 1-4.1: new low speed USB device using hci_hcd and address 12
[35523.968398 < 0.092117>] usb 1-4.1: New USB device found, idVendor=413c, idProduct=2003
[35523.968408 < 0.000010>] usb 1-4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[35523.968416 < 0.000008>] usb 1-4.1: Product: Dell USB Keyboard
That my friend, is awesome
ReplyDeleteAWESOME!
ReplyDeleteThanks for posting about this. Wow this is really sweet!
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteHow about a tail -f functionality, so that it can follow new kernel messages?
ReplyDeleteLandtuna, the UNIX philosophy is to do one thing and do it well. Tail -f already exists, so why duplicate that functionality in dmesg? You can always just do dmesg|tail -f
ReplyDeleteCyde, that won't work. tail -f works by checking the file constantly (or perhaps using one of the more recent APIs to have the kernel do the checking). dmesg is a program that spits out results and quits, there's nothing for tail -f to work with.
ReplyDelete(In general, it never makes sense to pipe into tail -f, only to run tail -f on a file(s).)
ad dmesg -f, this is already in util-linux TODO, but it's not so simple.
ReplyDeletehttp://www.spinics.net/lists/util-linux-ng/msg04491.html
http://www.spinics.net/lists/util-linux-ng/msg04498.html
We will see.
Nice!
ReplyDelete@Cyde Weys then why is he adding flags that we could just grep for, hmm?
ReplyDelete$ watch 'dmesg | tail'
ReplyDeleteI usually resort to this... but tailing it properly would be nice.
Thank you!
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