Another Linux utility, probably not installed by default, but very useful:
an interactive command which tells you about the performance of your system with respect to electrical power use. It makes fairly intelligent suggestions for reducing power use by suggesting kernel options and tweaks. It also shows a top-like list of processes and kernel drivers, ordered by how many wakeups they cause per second. Programs or drivers which poll for events instead of simply waiting will show as the power-wasters they are.
---------- Post updated 12-13-11 at 09:03 AM ---------- Previous update was 12-12-11 at 12:57 PM ----------
How do I check my system to see if the graphics are using hardware 3d suport or not. I have a TNT2 on RH 7.1 kernel 2.4.9-?(can't remember off top of my head)I'm running all the latest updates from RH. Also I now have a dvd drive and I am trying to find a player that will play all movies and not... (1 Reply)
Hello again,
I would like to know if the following commands:
diag, errpt, lscfg, lspv, lsvg, lsps, lslv for AIX and
prtdiag, psrinfo, sysdef for SUN are native to these systems or if they are in fact scripts that are added after the unix installation.
Thank you in advance.
Have a nice day (4 Replies)
HI ALL,
I am new tp HPUX and i am looking for command that will retive me the following information on HPUX:
Chassis Name & Serial Number:
Monitor
Name
BIOS
Name
EthernetPort
Name
IPEndpoint
Name
PointingDevice
Name
Keyboard
NetworkPrinter
Name
LocalPrinter (5 Replies)
Hello all,
i've written a small piece of code that will read commands from standard input and executes the commands.
Its working fine and is execting the commands well. Accepting arguments too. e.g
#mkdir <name of the directory>
The problem is that its not letting me change the directory i.e... (4 Replies)
I want to log into a remote server transfer over a new config and then backup the existing config, replace with the new config.
I am not sure if I can do this with BASH scripting.
I have set up password less login by adding my public key to authorized_keys file, it works.
I am a little... (1 Reply)
Hi all
Got another strange one. If I try to enquire about the hardware, the command hangs implying Ive got a hardware issue. So, if I execute :-
iostat -en
sysdef - ( stops at the devices part )
format
cfgadm -al
Anything that searches the devices, then the command hangs.
... (4 Replies)
Can someone help me with what I am guessing is a simple job for an AIX admin. However I am 100% HP-UX and not touched AIX before the start of this week.
I am trying to connect an IBM Blade (JS22) to our HP Enterprise Tape Library. I have done all the SAN zoning and this appears to be happy... (5 Replies)
Hi all,
I'm new in this forum.
I'm looking for the difference between the HACMP commands with the prefix "cl" and "cli".
The first type are under /usr/es/sbin/cluster/sbin directory and the second are under /usr/es/sbin/cluster/cspoc directory.
I know that the first are called HACMP for AIX... (0 Replies)
Hi folk,
I have this hardware faunty message, but dont know which hardware is this ? can you guide me ?
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TIME EVENT-ID MSG-ID SEVERITY
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Discussion started by: dehetoxic
9 Replies
LEARN ABOUT DEBIAN
halt
HALT(8) Linux System Administrator's Manual HALT(8)NAME
halt, reboot, poweroff - stop the system.
SYNOPSIS
/sbin/halt [-n] [-w] [-d] [-f] [-i] [-p] [-h]
/sbin/reboot [-n] [-w] [-d] [-f] [-i]
/sbin/poweroff [-n] [-w] [-d] [-f] [-i] [-h]
DESCRIPTION
halt notes that the system is being brought down in the file /var/log/wtmp, and then either tells the kernel to halt, reboot or power-off
the system.
If halt or reboot is called when the system is not in runlevel 0 or 6, in other words when it's running normally, shutdown will be invoked
instead (with the -h or -r flag). For more info see the shutdown(8) manpage.
The rest of this manpage describes the behaviour in runlevels 0 and 6, that is when the systems shutdown scripts are being run.
OPTIONS -n Don't sync before reboot or halt. Note that the kernel and storage drivers may still sync. This implies -d.
-w Don't actually reboot or halt but only write the wtmp record (in the /var/log/wtmp file).
-d Don't write the wtmp record.
-f Force halt or reboot, don't call shutdown(8).
-i Shut down all network interfaces just before halt or reboot.
-h Put all hard drives on the system in stand-by mode just before halt or power-off.
-p When halting the system, switch off the power. This is the default when halt is called as poweroff.
DIAGNOSTICS
If you're not the superuser, you will get the message `must be superuser'.
NOTES
Under older sysvinit releases , reboot and halt should never be called directly. From release 2.74 on halt and reboot invoke shutdown(8) if
the system is not in runlevel 0 or 6. This means that if halt or reboot cannot find out the current runlevel (for example, when
/var/run/utmp hasn't been initialized correctly) shutdown will be called, which might not be what you want. Use the -f flag if you want to
do a hard halt or reboot.
The -h flag puts all hard disks in standby mode just before halt or power-off. Right now this is only implemented for IDE drives. A side
effect of putting the drive in stand-by mode is that the write cache on the disk is flushed. This is important for IDE drives, since the
kernel doesn't flush the write cache itself before power-off.
The halt program uses /proc/ide/hd* to find all IDE disk devices, which means that /proc needs to be mounted when halt or poweroff is
called or the -h switch will do nothing.
AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl
SEE ALSO shutdown(8), init(8)
Nov 6, 2001 HALT(8)