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Operating Systems





Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.

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I have a lenovo a10-70f that only boots into recovery mode. I choose a command and I get the dead android logo with a triangle coming out of its stomach with a caption "no command"

My diagnostic is that the OS updated and screwed up, I've seen it similarly before with Google Play soft-bricking the entire tablet.

There is an option to update from from, does anyone know where I can get a copy of the original android image for this device? And where can I get a copy of the fastboot adb.sh file? I had it a while ago, and I lost it when my server mobo died.
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Hello, we encounter today with this issue from one of our macs.  We try to reinstall the osx again,  but when going to select the drive only recovery drive appears and not the local one, try to repair the hard drive by the startup disk utility,  reset the SMC but keeps jumping to the same utility,  see pictures attached. 20170919_113625.jpg20170919_113637.jpg20170919_113654.jpg20170919_113702.jpg20170919_113706.jpg20170919_113712.jpg
Thank you.
Here's a simple security tip: lock your computer when you're away! An unlocked work station leaves you ridiculously vulnerable and it's a simple thing to avoid.  Just get in the habit of hitting Ctrl-Alt-Del and choosing Lock every time you get up (for Windows anyway, adapt as needed for your specific OS choice).

You wouldn't leave your front door wide open when you're not at home, right? Same principle here :-)

Expert Comment

by:Brandon Lyon
There was a person who used to work here who would prove that point by using unlocked computers to send a random silly email to everyone
Hello All,

We are toying with implementing BitLocker on all workstations via GPO.  As usual, our wild is a couple of MacBooks that run Windows via BootCamp. Apple does not install a TPM chip on their systems, so if we were to encrypt these Windows installations, the users would need to have a USB drive connected at boot that contains the decryption key.

Does anyone know if this USB drive needs to remain connected at all times? or can it be removed once the operating system has loaded?
Here is a tip for faster linux software updates: make sure your software sources mirror lists are ranked and optimized. The link below explains how to do that with Arch based distros like Manjaro.

I recently extended a virtual disk that is used for a red hat server in ESX1 6.  What do I need to do so the Red Hat OS recognizes the new storage?
All system in domain:
Windows 7 Professional
Service Pack 1
64-bit OS

Our Nessus scans are indicating a vulnerability with the Product :
Microsoft Office 2016
  - C:\Windows\SysWOW64\mscomctl.ocx has not been patched.
    Remote version :
    Should be      :

There are two MSCOMCTL.OCX on the systems… one in the C:\PROGRAM FILES\MICROSOFT OFFICE\ROOT\VFS\SYSTEM folder which is the current version and the offending MSCOMCTL.OCX version found in C:\WINDOWS\SYSWOW64

My question is, is it safe to replace the offending MSCOMCTL.OCX with the newer OCX and if so what it the best way to do so?  I assumed I would need to unregister the OCX file, replace the old one with the new and run Regsvr32 on the newer OCX file.

PFA screenshot of found OCX files.


Has anyone run into this vulnerability and if so what was done to remediate the issue?  Many thanks in advance!
What is Citrix recommended reboot schedule for Delivery controllers ?
Hi, I am in possession of a mac from a former employee.  I can tell a new user with administration rights was created before the employee departure.  I am suspecting this new user was then used to securely delete the former employee’s user account.  The former employee would have had administration privileges on the Mac, so this would have been entirely possible.

Does anyone know if there is a log generated for this action?  Normally I would look in “private/var/log”, but I am not sure which file to look for.

I am also certain that a factory reset was not performed on this machine since the installation logs go back a couple years.

Any help would be greatly appreciated.
This is a server running RHEL 6.1
Over the last few days there have been several error events about one stick of RAM.

This gets posted in the console when it occurs:
Message from syslogd@server at Sep 13 20:24:06 ...
kernel:[Hardware Error]: No human readable MCE decoding support on this CPU type.

Message from syslogd@server at Sep 13 20:24:06 ...
kernel:[Hardware Error]: Run the message through 'mcelog --ascii' to decode.

Open in new window

Checking the logs at /var/log/mcelog shows this:

Hardware event. This is not a software error.
MISC 569aca0100090182 ADDR 2d34c31d80
TIME 1505387336 Thu Sep 14 07:08:56 2017
MCG status:
MCi status:
Corrected error
MCi_MISC register valid
MCi_ADDR register valid
Transaction: Memory read error
Memory read ECC error
Memory corrected error count (CORE_ERR_CNT): 1
Memory transaction Tracker ID (RTId): 82
Memory DIMM ID of error: 1
Memory channel ID of error: 2
Memory ECC syndrome: 569aca01
STATUS 8c0000400001009f MCGSTATUS 0
CPUID Vendor Intel Family 6 Model 44

Open in new window

It seems the error has been corrected...but it is occurring every few hours.
I also have OpenManage installed and that is showing the RAM status as Green.

Should I take this as a sign the RAM is failing or is it ok to leave as is since the errors are being corrected?
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I'm setting up a laptop (HP) that will play music for 18 hours every day - 7 days a week. Music sources are net radio and locally stored  playlists (.mp3). I've tried two media players (VLC and wmplayer) running under Win 10 pro. Experienced some lock-up situations (1 - 2 week interval) and I'm now in the process of replacing the laptop with same type. I'm also thinking of going back to Win 7 Pro as the OS, but I'm not sure if it is better with respect to stability.
Any ideas / experiences to share?
Hi all,

I have an old machine which has server 2003 OS with VMware version Version 1.0.10. Yes, you read it right Version 1.0.10. This hosts an XP machine which has an oracle db on it.

Long story short, I have no admin pw's for the oracle db in order to shutdown cleanly and migrate to a new machine so I was wondering if anyone has been able to convert a VMware VM to a hyper-v machine.

On our new server we are running Win server 2012 R2 with hyper-v and would ideally like to migrate to this so I can backup, monitor and manage.

In an ideal world, I would love to be able to use something like Veeam to back up the XP machine, then restore but the version of Veeam (version 9), doesn't support server 2003.

Any suggestions?
How to install xorg clean - without window manager, without Gnome or KDE or other on Cent OS 7
I am using Lenovo Laptop , Model NO:  G570 , When i click on any options from my desktop, it automatically points to the first file/options/folder etc. I have done the reboot of my OS to Win 7 as well, still the problem Exists.
When i use my chrome and hovering down the web page, its not moving down, Automatically, it comes to the first options of the Web page.
After Multiple Refresh of pressing F5, problem will be solved, After sometime Problem again Restarted.

Someone please help me in this Laptop Problem.
In Win 10, how to get into Control panel to uninstall/install program?
My OS is win 10 prof 64 bit and i use Google Docs to format my documents then to publish it in Google Groups.  Sometimes I have graphics and I am sure they may not show up on some pcs, and to overcome this, I thought of having a line :
To view in browser, click here.
But how do I implement this, that will take the message viewed and display in a browser.  
Thank u and regards.
I had this question after viewing Cent OS and Zscaler pac file.

We use Zscaler proxy pac file and I have a CentOS 6.9 physical machine that needs to get updates via yum.

password for su
vi /etc/yum.conf

press "i" to enter insert mode and added the proxy info:

proxy = http://ZscalerIP:ZscalerPort/
proxy = http://username:password@ZscalerIP:ZscalerPort/

Once I added this saved and close press "Esc" and then ":wq" and then press Enter

Then ran:

yum - y update

And it was updating just fine.

However, since the first yum updates and reboot the machine has not been able to update via yum.

To help outline what has been done so far:


Can someone please help me to resolve?

Thank you
On a server which has been working for roughly two years, we are suddenly unable to send faxes. There was an issue recently which resulted in my having to empty the queue folders and remove and reinstall all the fax modems.

Stations attempting to send a fax see the error "Unable to retrieve cover pages associated with the selected account".

If I remove the account and attempt to add it again, I get "You do not have security permissions to complete this operation"

Server os is 2008r2. Stations are all Windows 7 Pro. Updates on both are fairly current.

I've already gone through the (very few) discussion threads I found out on the web that appeared to be relevant. All the permissions for folders, services, and the fax services themselves appear to be correct as far as I can tell. I'm not seeing anything in the event logs on server or stations that appear relevant.

On the server itself, I am able to create an account in Windows Fax & Scan without issue. On the stations I am able to connect directly to the fax "printer" (which doesn't really do anything but show access permissions to the device itself, of course)
I have a standalone root CA, windows 2008 R2, which issues SHA-1 certificates.  The Root certificate is coming up on expiring, and I would like to renew this and upgrade to SHA-2.  Reading through several Technet articles, and trying to make heads or tails of the process.  From what I gather, since this is a Win2008 R2 server (CA), issuing SHA-1, I cannot upgrade to SHA-2?  Does the server OS need to be Windows 2012 (R2) in order to issue the SHA-2 certs?  Trying to find information regarding the OS requirements for the CA to issue SHA-2 certificates.
Thank you,
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I am having strange issue on a VM when I move it to Esxi 6.5. The server’s CPU reaches 100% at OS level.
It back to normal when I move it back to ESXi ver 6.0 host. The VM hardware ver is 7. Does ver 7 hardware supports in Esxi 6.5?
I am looking to determine whether the 3rd party libraries I utilize are compatible with several operating systems, for porting feasibility. Information on any of the library/OS pairs would be appreciated.

Operating Systems:
  • HP_UX
  • Inspur K-UX

  • mpfr
  • mpc
  • binutils
  • autoconf
  • automake
  • libtool
  • cmake
  • libxml2
  • pcre
  • net-snmp
  • openal
  • freealut
  • ogg
  • vorbis
  • kerberos
  • rcs
  • gtest
  • openssl
  • opc_ua
  • opc_ua_client
  • cip_sdk
  • zlib
  • gmock
  • podofo
  • qxt
  • qtwebapp
  • kdsoap
Long story short, I accidently deleted the volume using fdisk.  It had the Windows OS. I think  Windows 7 Professional on it. Nothing on there truly important but would save me a lot of time if I could just recover the volume instead of reinstalling everything. I have the HD attached to my computer now. Attached Pic shows HD as Disk 1 and missing OS is the Unallocated 450 GB partition. I have installed testdisk but it doesn't find any missing partitions. Not sure how to use it. Should I use one of the advanced options? Would appreciate any help, step-by-step on how to recover this volume.
Does anyone have any suggestions on utilities to do backups for OS Windows 10? Since this is a general questions I will apply points to everyone that answers this within the next 1 hour and 50 minutes! :)

I would like a complete back up of apps and data if that's possible.
Can you please provide me with the exact syntax of the Symbolic Links command I would use that will allow the folder path "C:\Users\[UserName]\Google" to appear as if it is located within the "C:\Users\[Username]\Box Sync" folder so that the contents of folders within the "C:\Users\[UserName]\Google" will be backed up by Box.com even though it is actually located in the other folder.

This needs to be done since Box.com will only backup folders that are located within the Box Sync folder. Folders in other paths can't be selected to be backed up unless they are contained within the Box Sync folder. Therefore I need to find a way of insuring that Box.com will backup these other folder locations since I am unable to move the folders and data located within the "C:\Users\[UserName]\Google" folder to a different location.

This needs to be done within Windows 10 and can be done using Symbolic Links. I just need to know the correct syntax and how to set this up using Symbolic Links.

These URLs discuss Symbolic Links:

MSDN Forums

Symbolic Links

Hard Links and Junctions

Also please let me know if any further information is needed.
We currently have a server that has two 450GB drives in raid 1 and we are constantly facing space issues on this server. We are wondering if we replace one of the drives with a new 900GB drive, let it rebuilt, then replace the other 450GB drive with another 900GB and let it rebuild. Can we then extend the volume in the raid controller and then again in the OS to increase the space?

This is a physical server, so we can't just add more space like a VM. It would also be a last resort to rebuild the server on larger drives, which is why we are looking at the above solution.

Does anyone have experience with this, or know if it will work?

Operating Systems





Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.