Using “screen” on Linux to perform your important work? Way to go, SysAdmin 🙂 Then you might at some point encountered the following behavior – while attempting to resume a session using “screen -r”, the following message occurred : There is a screen on: 1610.pts-0.host (25/08/18 08:25:36 PM) (Attached) There is no screen to be… Read More »
Similar as what you can do on linux with the Message Of The Day (MOTD), there is a way to display a message to users when they login to their session. Microsoft refer to this as a “legal notice” and can be achieved through the registry. 1. Open the Windows Registry Editor with elevated privileges… Read More »
The easiest way to get hardware serial and related information is using “dmidecode“. The command below should give you exactly what you need :
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dmidecode -s system-serial-number |
The command above does not usually work with “clone” computers/servers. Alternatively, you may use the command below, which will output all parts serial number availables :
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dmidecode | grep "Serial Number:" |
This tutorial will show you the simple steps to upgrade your Ubiquiti Unifi SDN Controller running on Windows. The software can be found on the manufacturer Web site (https://www.ubnt.com/download/unifi). We recommend using the LTS (Long Term Support) version unless you need the bleeding edge features. Upgrading to newer version might not allow downgrade in case of… Read More »
Here is a simple PowerShell command that will output the FC host adapter interface WWNs.
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Get-WmiObject -class MSFC_FCAdapterHBAAttributes -namespace "root\WMI" | ForEach-Object {(($_.NodeWWN) | ForEach-Object {"{0:x}" -f $_}) -join ":"} |
If your interface have two ports, both will be output in order. This command have been successfully tested with QLogic adapters on Windows 2012 and 2016.
Here is some useful commands to display a domain Time To Live (TTL) using the DIG command (which is usually included within “bind-utils” package). To display the full information :
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dig +nocmd +multiline +noall +answer any domain.tld |
To display the short, default answer :
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dig +nocmd +noall +answer domain.tld |
NOTE : Replace “domain.tld” by the domain you want to query.
If you are not satisfied with the refresh rate of DNS within your active directory environment, there is a way of forcing it by increasing or decreasing the default setting in the registry. First of all, there is a command to find out your curent settings :
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dnscmd /info /dspollinginterval |
It should output something similar to :… Read More »
Here is some useful commands to list the members of a group in Active Directory using PowerShell. Get members of a group :
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Get-ADGroupMember -Identity "Groupe Name" |
Get members of a group, recursively (to list all members of sub-groups members of that group) :
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Get-ADGroupMember -Identity "Group Name" -Recursive |
NOTE : Replace “Group Name” (keeping the double quotes) with the desired Group… Read More »
You are probably used to all these “get my IP” or “find my IP” kind of site, which show your external / Internet IP on a Web page. However you might be facing some challenge if you are on a CLI only kind of machine. Fortunately there is a few ways to find your public… Read More »
Getting this error from the R1Soft repo lately trying to run a “apt-get update” on Debian Linux? Ign http://repo.r1soft.com stable Release W: GPG error: http://repo.r1soft.com stable Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 39A4965166BD1D82 Simply do the following to import the new key and get rid of… Read More »