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cat /var/log/syslog |less cat /var/log/syslog|lessThey call dmesg the kernel ring buffer utility. In this case, dmesg is an actual command you execute which displays kernel log data. This information is also sent in real time to syslogd or klogd, when they are running, and ends up in /var/log/messages. The dmesg command captures boot-time messages from before syslogd. Type: dmesg|lessAgain, the pipe - less is used to buffer it so you can scroll up and down or perform regex search. Use dmesg to see what occurred during system boot. Things go wrong such as a file system failing to mount or a device driver failing to load, and these events will show up in dmesg.