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06-08-2007
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/etc/utmp file does not get updated with boot up details
In a frequent interval the system bootup is not updating the /etc/utmp file with the system boot details.
This leads to blank output of who - b command. What can be the reason for the same? 
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06-11-2007
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There are few possible reasons.... Make sure the root partition isn't running out of space, make sure the file is not "world-writable" i.e. rw-rw-rw /etc/utmp. I've heard of solutions when you "zero" the files, reboot and hope to work, although I haven't done it myself.
What actions have been done prior to system reboot ? Hardware maintanence, abnormal interruption of "shutdown -r" || reboot ? Did you try grepping for erros at the log files, and also, what is the OS ?
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