Disable monitor blanking on Debian with LXDE for remote access using NoMachine and VNC

By technese - Last updated: Sunday, November 11, 2018

Edit file: /etc/xdg/lxsession/LXDE/autostart
@xscreensaver -no-splash


@xset s noblank
@xset s off
@xset -dpms

Sources: https://raspberrypi.stackexchange.com/questions/752/how-do-i-prevent-the-screen-from-going-blank

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Patch vSphere 5.5 Updates

By technese - Last updated: Saturday, September 22, 2018

(OLD: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2008939)


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Search for string in file system in Linux

By technese - Last updated: Thursday, October 22, 2015

Search for the string ‘root’ in the entire filesystem

# grep -H -R root ./* | cut -d: -f1

Source: http://www.cyberciti.biz/faq/howto-search-find-file-for-text-string

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Shrink qemu qcow2 files

By technese - Last updated: Thursday, October 22, 2015

Excerpt from source:

Windows Guest

1.Delete all unnecessary files, empty recycle bin
2.Defragment drive (you might need to do this several times, until you see it “compacted” well)
3.Use sdelete to zero free disk space. Please note that this operation will cause that all drive free space will be filled by zero, so the virtual machine image will grow to the maximum size.

Using command prompt

sdelete -c c:

Linux/FreeBSD Guest

# dd if=/dev/zero of=./zero bs=1M
# sync
# rm -f ./zero

Note, the bs parameter is important, since it greatly reduce time necessary to complete this task.

Convert image to the same format that is currently is (e.g. qcow2 => qcow2)… during this procedure it will release unused space.

# qemu-img convert -O qcow2 w2k3.qcow2 w2k3-shrinked.qcow2


Download sdelete from here:


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Find files larger than 50 megabytes in Linux

By technese - Last updated: Thursday, October 22, 2015

Find files larger than 50 megabytes

$ find . -type f -size +50000k -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'

Reference: http://www.cyberciti.biz/faq/find-large-files-linux

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Best compression using tar and 7z

By technese - Last updated: Sunday, September 7, 2014

Compress using tar and 7z

$ tar cf - <source folder/file> | 7z a -si <Destination archive>.tar.7z

$ 7z x -so yourfile.tar.7z | tar xf - -C target_dir

1. http://askubuntu.com/questions/300097/how-do-i-create-tar-7z-file-from-the-command-line

2. http://askubuntu.com/questions/341628/how-to-extract-tar-7z-files-from-command-line

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Converting OVA to QCOW2 for use with QEMU/KVM

By technese - Last updated: Sunday, September 7, 2014

Extract the .ova file

$ tar -xvf file.ova

Convert the .vmdk to .qcow2

$ qemu-img convert -O qcow2 file.vmdk file.qcow2


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Block Inbound for Ports 135, 445, 1028 and Ping (ICMP 8) for Windows 7, 2008 Server

By technese - Last updated: Monday, April 1, 2013

For workstations/servers that are public Internet facing and do not have a  hardware/software firewall solution, use Windows Firewall with Advanced Security and block port 135, 445, 1028 and PING (ICMP 8) .  GRC’s Shields Up! shows these ports as being open.




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Check Linux with rootkithunter and chkrootkit

By - Last updated: Sunday, November 4, 2012

Debian Linux

# apt-get install chkrootkit rkhunter


# aptitude install chkrootkit rkhunter

CentOS 6.x

# yum install chkrootkit rkhunter

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Import Active Directory Domain Services Cmdlets

By technese - Last updated: Monday, October 29, 2012

Open Powershell Prompt

PS C:\> Import-Module active*
PS C:\> Get-Command -Module active



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