Troubleshooting NTP issues, what does echo $? mean?
Doing some straight forward troubleshooting of NTP.
Once of the commands that I see to troubleshoot NTP is
# echo $?
I know this is some sort of Shell Command, however I don't understand what the command does and why it returns a value of 0 for our servers that are setup correctly for NTP.
The ones that aren't setup correctly for NTP is either returns a 1 or 0.