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Full Discussion: What's wrong with my "grep"
Top Forums Shell Programming and Scripting What's wrong with my "grep" Post 302437219 by methyl on Wednesday 14th of July 2010 10:29:08 AM
Old 07-14-2010
I think that the concept is flawed. On my system "dmesg" puts today's date in the heading and then outputs any system messages - even if they happened months ago. The messages themselves are rarely dated.
It is more relevant to look at the log from "syslogd" (the name and location of which depends on the Operating System).

What does your dmesg output look like?
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dmesg(1M)																 dmesg(1M)

NAME
dmesg - collect system diagnostic messages to form error log SYNOPSIS
DESCRIPTION
looks in a system buffer for recently printed diagnostic messages and prints them on the standard output. The messages are those printed by the system when unusual events occur (such as when system tables overflow or the system crashes). If the argument is specified, com- putes (incrementally) the new messages since the last time it was run and places these on the standard output. This is typically used with (see cron(1)) to produce the error log by running the command: every 10 minutes. The arguments and allow substitution for the defaults and where should be a file containing the image of the kernel virtual memory saved by the savecrash(1M) command and should be the corresponding kernel. If the system is booted with a kernel other than /stand/vmunix say /stand/vmunix_new, must be passed this name, the command must be, WARNINGS
The system error message buffer is of small, finite size. is run only every few minutes, so there is no guarantee that all error messages will be logged. AUTHOR
was developed by the University of California, Berkeley. FILES
error log (conventional location) memory scratch file for option special file containing the image of kernel virtual memory the kernel, system name list SEE ALSO
savecrash(1M). dmesg(1M)
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