The Wiert Corner – irregular stream of stuff

May 2026
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How to Reclaim Purgeable Space on Mac – Bambielli’s Blog / Ask Different

Posted by jpluimers on 2021/10/22

For my link archive:

[WayBack] Not a Kitteh on Twitter: “Check with Disk Utility if APFS hasn’t reclaimed free space yet? In that case, create a huge file a couple of times and it should do whatever it does to actually make free space free again.…”
[WayBack] Not a Kitteh on Twitter: “I guess you could try running something like described here as a cron job? https://t.co/1mk8I83JBM… “
[WayBack] How to Reclaim Purgeable Space on Mac – Bambielli’s Blog
[WayBack] macos – How do I clear the purgeable area on my disk? – Ask Different
[WayBack] Create a Large File from the Command Line or Disk Utility for Testing Purposes
- dd (be sure to use the bs parameter to improve writing speed by having a relatively large block size)
- mkfile
- Disk Utility (by creating a large disk image)
[WayBack] linux – Does the “bs” option in “dd” really improve the speed? – Server Fault
[WayBack] Find Large Files in Mac OS X with Search

–jeroen

Read the rest of this entry »

Posted in Apple, Mac OS X / OS X / MacOS, Power User | Leave a Comment »

Using Google/Cloudflare/central DNS can bite you with large downloads

Posted by jpluimers on 2021/10/22

If you think download speeds are slow for large downloads (or multi-media playback is slow or quality is low) on a fast link, then consider your DNS.

Many people report that using one of the centralised DNS services (like Google/Cloudflare/…) causes slowness because they direct CDN lookups to a small pool of servers that get overloaded.

Some links:

Via [WayBack] How to check whether DNS is working through a browser? – Super User

Google DNS also allows for interactive querying, for example [WayBack] Google Public DNS

Read the rest of this entry »

Posted in Cloud, Cloudflare, DNS, Hardware, Infrastructure, Internet, Network-and-equipment, Power User | Leave a Comment »

Legality of Dutch non-reanimation statements

Posted by jpluimers on 2021/10/22

For my link archive:

[WayBack] De niet-reanimerenpenning | Niet-reanimerenpenning | Producten

De niet-reanimeren penning wordt aangeboden door de patiëntenfederatie Nederland en wordt erkend door zorgverleners en hulpdiensten.
The above supersedes the still legal [WayBack] Reanimeer mij niet

De niet-reanimerenpenning is een behandelverbod ten aanzien van reanimeren. Een verklaring aan een halskettinkje, voorzien van pasfoto, handtekening, naam en geboortedatum.
[WayBack] NVVE :: Niet-reanimeren tatoeage rechtsgeldig

Een tatoeage met de tekst die aangeeft dat de drager ervan niet gereanimeerd wil worden, is volgens minister Schippers van Volksgezondheid rechtsgeldig.
[WayBack] Reanimeren en de niet-reanimeren verklaring – FPVI

The above are legally binding, but not all medical personnel knows them by heart.

The legal document is the hardest for the medics to find, so way easier are the badges or tattoos.

Via [WayBack] Sander de Hosson on Twitter: “Zie deze tattoo best wel vaak. Is dit rechtsgeldig, @Gert_van_Dijk? #dtv… “

–jeroen

Read the rest of this entry »

Posted in About, LifeHacker, Personal, Power User | Leave a Comment »

HTML cleanup tool & simplifier. For basic & clean HTML 🔧

Posted by jpluimers on 2021/10/21

I have used other on-line HTML cleanup tools in the past (especially for including parts of web-pages in a blog post), but so far none beats HTML Washer: [Wayback] HTML cleanup tool & simplifier. For basic & clean HTML 🔧

An online tool that reduces HTML to basic tags and attributes. Removes scripts, CSS, and other non-basic elements like , , etc… Also, corrects errors and formats the HTML doc or a fragment.

–jeroen

Posted in Development, HTML, Power User, SocialMedia, Software Development, Web Development, WordPress | Leave a Comment »

Zombie Processes are Eating your Memory | Random ASCII

Posted by jpluimers on 2021/10/21

Zombies probably won’t consume 32 GB of your memory like they did to me, but zombie processes do exist, and I can help you find them and make sure that developers fix them…

Source: [WayBack] Zombie Processes are Eating your Memory | Random ASCII

For my link archive via [WayBack] In short, close handles after process opening or creation, or it leaks and zombie process stays consuming 64k. – Ilya S – Google+

–jeroen

Posted in Development, Software Development, Windows Development | Leave a Comment »

Reminder to self: script blocks inside .ForEach calls can have Begin/Process/End blocks

Posted by jpluimers on 2021/10/21

I need to write some tests for this, but it looks like you can use the keywords Begin/Process/End with code blocks when the script block is inside a .ForEach member call.

The behaviour seems to be the same as if these blocks are part of a function that executes inside a pipeline (Begin and End are executed once; Process is executed for each item in the pipeline).

It’s hard to Google on this, as all hits of all queries I tried got me into these keywords in the context of functions.

The below links are on my reading list.

Microsoft documentation:

SS64 docs (which has guidance on which of the 3 foreach constructs to use when):

[WayBack] ForEach method – PowerShell – SS64.com
[WayBack] ForEach – PowerShell – SS64.com on the foreach statement)
[WayBack] ForEach-Object % – PowerShell – SS64.com (aliased ForEach and %)
[WayBack] Function Begin Process End – PowerShell – SS64.com[WayBack] Powershell Arrays – PowerShell – SS64.com
[WayBack] Scriptblocks – PowerShell – SS64.com

Social media and blog posts:

StackOverflow entries:

[WayBack] powershell – How does begin/process/end save the need for foreach? Still needed for the parameter isn’t it? – Stack Overflow
[WayBack] PowerShell: the mysterious -RemainingScripts parameter of ForEach-Object – Stack Overflow
[WayBack] powershell – Use Begin, Process, End in Scriptblock – Stack Overflow
[WayBack] Difference between ForEach and ForEach-Object in powershell – Stack Overflow
[WayBack] PowerShell: How to get count of piped collection? – Stack Overflow
[WayBack] powershell – Nested function inside a function with begin/process/end blocks? – Stack Overflow
[WayBack] PowerShell Pipeline iteration – Stack Overflow

[WayBack] powershell – How to query registry values skipping the PS* ones – Stack Overflow (thanks [WayBack] User Keith Miller – Stack Overflow / [WayBack] Keith A. Miller – Microsoft Community for bringing this to my attention)

I know this is truly old, but here’s a function I added to my Profile to facilitate registry exploration:

Function Get-KeyProperty  {
Param(
    [Parameter(Mandatory=$true,ValueFromPipeline=$true)]
    [ValidateScript( {(Resolve-Path $_).Provider.Name -Like 'Registry'} )]
    [String[]]
    $Path,
    [String[]]
    $Name=@("*")
)
Process {
    $Name.ForEach({ (Get-Item $Path).Property -like $_}).ForEach({
        Begin {$Hash = @{}}
        Process { $Hash += @{ $_ = (Get-Item $Path).GetValue($_)} }
        End {[PSCustomObject]$Hash}
    })
}}

…

–jeroen

Posted in CommandLine, Development, PowerShell, PowerShell, Scripting, Software Development | Leave a Comment »

Difficult programming concepts explained in tweets

Posted by jpluimers on 2021/10/20

Highlights from the thread [Archive.is] Tomasz Łakomy on Twitter: “What’s the most difficult programming concept you can explain in a tweet?”

Finally a cheat (as it has an image), but great illustration:

Read the rest of this entry »

Posted in Development, SocialMedia, Software Development, Twitter | Leave a Comment »

Filippo Valsorda on Twitter: “whoami.filippo.io , the SSH server that knows who you are … Try it out! $ ssh http://whoami.filippo.io”

Posted by jpluimers on 2021/10/20

[Archive.is] Filippo Valsorda on Twitter: “whoami.filippo.io , the SSH server that knows who you are, got some newly refreshed intel! Try it out! $ ssh whoami.filippo.io “

The server itself has some HTML with information too whoami.filippo.io redirecting to [WayBack] ssh whoami.filippo.io (source code is at [WayBack] GitHub – FiloSottile/whoami.filippo.io: A ssh server that knows who you are. $ ssh whoami.filippo.io).

It’s a cool open source server written in Golang, that gets all your public ssh keys (ssh automatically transmits those) and tries to map them back to a GitHub account.

In addition it shows you some potential vulnerabilities of your ssh client.

Note that in October 2020, it was temporarily down, but it will be up again: [Archive.is] Filippo Valsorda 💉💉 on Twitter: “Yeah I’m planning to but I can’t give you an ETA I’m afraid. A few weeks, maybe?… “

Thread comments

Some interesting comments in the thread:

Stop presenting public keys

[WayBack] GitHub – FiloSottile/whoami.filippo.io: A ssh server that knows who you are. $ ssh whoami.filippo.io: How do I stop passing public keys

How do I stop it?

If this behavior is problematic for you, you can tell ssh not to present your public keys to the server by default.

Add these lines at the end of your ~/.ssh/config (after other “Host” directives)
Host *
    PubkeyAuthentication no
    IdentitiesOnly yes
And then specify what keys should be used for each host
Host example.com
    PubkeyAuthentication yes
    IdentityFile ~/.ssh/id_rsa
    # IdentitiesOnly yes # Enable ssh-agent (PKCS11 etc.) keys
If you want you can use different keys so that they can’t be linked together
Host github.com
    PubkeyAuthentication yes
    IdentityFile ~/.ssh/github_id_rsa

–jeroen

Read the rest of this entry »

Posted in *nix, *nix-tools, Communications Development, Development, Go (golang), Internet protocol suite, Power User, Software Development, SSH, ssh/sshd, TCP | Leave a Comment »

The hard part of a crypto specification: make it safe and misuse resistant.

Posted by jpluimers on 2021/10/19

Great quote from a while back:

[WayBack] Filippo Valsorda on Twitter: “Here’s a secret: it’s not that hard to put together a crypto specification. What’s hard is to make it safe and misuse resistant. What needs to be “battle tested” is the security devex, not the narrow happy path, and blaming the developer when it breaks is not battle testing.”

From the same thread:

- [WayBack] Filippo Valsorda on Twitter: “Here’s a secret: it’s not that hard to put together a crypto specification. What’s hard is to make it safe and misuse resistant. What needs to be “battle tested” is the security devex, not the narrow happy path, and blaming the developer when it breaks is not battle testing.”

–jeroen

Read the rest of this entry »

Posted in Development, Power User, Security, Software Development | Leave a Comment »

VMware ESXi has 2 bootbanks; with some luck the second contains your old ESXi version

Posted by jpluimers on 2021/10/19

Just in case I ever need this again:

[Wayback] VMware Knowledge Base: Reverting to a previous version of ESXi (1033604)
1. In the console screen of the ESXi host, press Ctrl+Alt+F2 to see the Direct Console User Interface (DCUI) screen.
2. Press F12 to view the shutdown options for the ESXi host.
3. Press F11 to reboot.
4. When the Hypervisor progress bar starts loading, press Shift+R. You will see the warning:
```
Current hypervisor will permanently be replaced
with build: X.X.X-XXXXXX. Are you sure? [y/n]
```
5. Press Y to roll back the build.
6. Press Enter to boot.
[Wayback] Downgrade ESXi 6.5 from update 3 to update 2 – VMware Technology Network VMTN; when out of luck:
- This is not my case.As I mentioned, I don’t have altbootbank with update 2. This is because after update 3, I also installed the latest patch.So both bootbanks now have update 3.Is there any other option for me. Can I just install update 2 again so it will overwrite everything? Or it is impossible?
- Backup ESXi configurations and reinstall it without overwriting VMFS.

Via: [Wayback/Archive.is] downgrade esxi 6.5 u3 to u2 – Google Search

–jeroen

Posted in ESXi6, ESXi6.5, ESXi6.7, ESXi7, Power User, Virtualization, VMware, VMware ESXi | Leave a Comment »

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The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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How to Reclaim Purgeable Space on Mac – Bambielli’s Blog / Ask Different

Using Google/Cloudflare/central DNS can bite you with large downloads

Legality of Dutch non-reanimation statements

HTML cleanup tool & simplifier. For basic & clean HTML 🔧

Zombie Processes are Eating your Memory | Random ASCII

Reminder to self: script blocks inside .ForEach calls can have Begin/Process/End blocks

Difficult programming concepts explained in tweets

Filippo Valsorda on Twitter: “whoami.filippo.io , the SSH server that knows who you are … Try it out! $ ssh http://whoami.filippo.io”

Thread comments

Stop presenting public keys

How do I stop it?

The hard part of a crypto specification: make it safe and misuse resistant.

VMware ESXi has 2 bootbanks; with some luck the second contains your old ESXi version

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Recent Posts

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Meta title

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Stop presenting public keys

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