04-06-2009
Quote:
Originally Posted by
hpicracing
don't really know anyone experienced with Unix that I can doublecheck with. So, what exactly do you mean by be very careful? Google how to do stuff before trying it?
This was a more generic comment than what you seem to have understood. To borrow a 'trade' term, measure twice, cut once. Make sure that before you do something in the real world that it is the right thing. We all do things to our own systems that we would never consider doing on production systems because all it costs us is a little time if it goes bad. On the other hand that little bit of time is VERY expensive if it happens on mission critical systems or ones where there are a large number of users impacted.
Learning to use and administer your own Linux/Solaris is not the same as being able to deal with the types of issues that can on a large Unix system. As a really simple example a reboot on a pc will take a couple of minutes but a reboot on a large unix system can take a long time ( I have known fully populated SunFire 6900s take an hour or more to reboot )
Quote:
Where you said "I would always recommend to have some professional training from the Vendor (Sun/IBM/HP) and at least an entry certification before applying for a sysadmin job." How would I go about getting some professional training from any of those(sun/ibm/hp) and also getting an entry certification?
Sorry for all these questions. I'm a newbie so I'm really lost right now on where to start.
I have an uncle who probably knows a lot about Unix because of his job. I will be seeing him some time in may so he may be able to give me a bit of advice and help me out.
Thanks again for the info!
For training, all the vendors have information about their education services on their websites, you can often find third parties that give adequate if not quite equivalent course.
The vendor websites will also have info on certifications.
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LEARN ABOUT CENTOS
shutdown
SHUTDOWN(8) shutdown SHUTDOWN(8)
NAME
shutdown - Halt, power-off or reboot the machine
SYNOPSIS
shutdown [OPTIONS...] [TIME] [WALL...]
DESCRIPTION
shutdown may be used to halt, power-off or reboot the machine.
The first argument may be a time string (which is usually "now"). Optionally, this may be followed by a wall message to be sent to all
logged-in users before going down.
The time string may either be in the format "hh:mm" for hour/minutes specifying the time to execute the shutdown at, specified in 24h clock
format. Alternatively it may be in the syntax "+m" referring to the specified number of minutes m from now. "now" is an alias for "+0",
i.e. for triggering an immediate shutdown. If no time argument is specified, "+1" is implied.
Note that to specify a wall message you must specify a time argument, too.
If the time argument is used, 5 minutes before the system goes down the /run/nologin file is created to ensure that further logins shall
not be allowed.
OPTIONS
The following options are understood:
--help
Prints a short help text and exits.
-H, --halt
Halt the machine.
-P, --poweroff
Power-off the machine (the default).
-r, --reboot
Reboot the machine.
-h
Equivalent to --poweroff, unless --halt is specified.
-k
Do not halt, power-off, reboot, just write wall message.
--no-wall
Do not send wall message before halt, power-off, reboot.
-c
Cancel a pending shutdown. This may be used cancel the effect of an invocation of shutdown with a time argument that is not "+0" or
"now".
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.
SEE ALSO
systemd(1), systemctl(1), halt(8), wall(1)
systemd 208 SHUTDOWN(8)