clockcheck connects to the time service (TCP port 37) on the named list of hosts and prints their reported time. It also flags hosts that are more than a specified number of seconds off from the current host.
It is intended as an administrative tool to poll a bunch of hosts and find ones where the clock has drifted too far.
clockcheck -t 4 www.ics.com rftm.mit.eduCompares the current host to www.ics.com and rftm.mit.edu. It will print a warning if either of the remote hosts reports a time that is more than 4 seconds different from the local host.
Note: The manual page below is produced using man2html. There are several formatting gliches which are unavoidable at this time. A correctly formatted manual page is in the file clockcheck.txt in the package.
clockcheck - compare times on a set of hosts SYNOPSIS clockcheck [-q] [-S] [-t threshold] [-p port] host ... DESCRIPTION Clockcheck compares the clocks of a set of hosts as reported by the time service on port 37. It flags any hosts that have a time differing from this host by a user- specified delta. This can be used to quickly check all machines in a farm to see if any of them have lost their clock synchronization. It can also be used to set the system clock by snarfing the value of another system. When run from crontab this way it makes a poor man's xntpd. For example * * * * * /usr/local/bin/clockcheck -S timehost >/dev/null OPTIONS -q Quiet mode. Do not print names of hosts that have the correct time. -S Set the clock based on the average difference from all the remote machines. You must be super-user to do this. -t threshold Specify the allowed time difference in seconds. (Default: 0) -p port Use specified port rather than 37. EXAMPLES clockcheck -t 10 www.aiu.to www.ics.com AUTHOR Tony Aiuto <email@example.com>
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