On systems that have been up a long time or that spew lots of kernel messages, running dmesg might not give you everything (i.e. just a buffer of the last X mes

On systems that have been up a long time or that spew lots of kernel messages, running dmesg might not give you everything (i.e. just a buffer of the last X messages), you can typically find a complete dmesg log in /var/log/dmesg, which should have a complete dmesg log from boot. I use dmesg a lot, for debugging issue, check if drivers have been loaded, kernel messages, like ops or oom, etc. Very handy!