# Debian
sudo apt install zbar-tools
# macOS
brew install zbar
zbarimg qrcode.pngTest internet speed using Cloudflare and curl
The script tests download of 5MB file and upload of 1MB file using speed.cloudflare.com.
#!/bin/sh
set -e
curl -L -o /dev/null -s -w \
'Download: %{speed_download} B/s' \
'https://speed.cloudflare.com/__down?bytes=5000000' |
awk '/^Download:/ { printf "Download (5MB): %.2f Mbit/s\n", $2 * 8 / 1000000; next } { print }'
dd if=/dev/zero bs=1000000 count=10 2>/dev/null |
curl -sS -o /dev/null -w 'Upload: %{speed_upload} B/s' \
--data-binary @- https://speed.cloudflare.com/__up |
awk '/^Upload:/ { printf "Upload (1MB): %.2f Mbit/s\n", $2 * 8 / 1000000; next } { print }'Connect to macOS from Windows
I used to connect to MacOS remote desktop using RealVNC.
I create a local port forward:
ssh -L 25900:127.0.0.1:5900 username@MAC_IPI was than able to connect using 127.0.0.1:25900. But that stopped working after macOS upgrade. I started getting Key Length Too Large error. RealVNC does not seem to fix it event in latest version 8.5.
So I was looking for alternative client that supports macOS username login. Most clients only seem to support password only login. What worked for me was gvncviewer in WSL. The only problem is that it does not seem to support port change, so I have to use 5900 instead of 25900 for local connection.
sudo apt install gvncviewer
ssh -L 5900:127.0.0.1:5900 username@MAC_IP
gvncviewer 127.0.0.1Get list of uninstall strings for installed Windows applications using PowerShell
$paths = @(
"HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*",
"HKLM:\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*"
"HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*"
)
Get-ItemProperty $paths -ErrorAction SilentlyContinue |
Where-Object DisplayName |
Select-Object DisplayName, UninstallString, QuietUninstallString |
Format-ListFind Bitlocker recovery key ID in Linux
Using cryptsetup you can get ID (GUID) for every protector used. Look for VMK protected with recovery passphrase to get the recovery key.
sudo cryptsetup bitlkDump /dev/sdbXCreate exFAT partition in Linux
- Using
fdiskcreate partition with type Microsoft Basic Data - Format the partition
mkfs.exfat /dev/sdbX
Convert Windows 7 VM from VirtualBox to Hyper-V
I used qemu utils in WSL for the disk conversion:
sudo apt install qemu-utils
qemu-img convert -f vdi -O vhdx "Windows 7.vdi" "Windows 7.vhdx"VM in Hyper-V has to be created as Generation 1 with disk in IDE controller. The problem is that VirtualBox uses SATA driver by default. So after VM started I got BSOD 0X0000007B. I had to load PCI driver after start of Windows. To do it I have used startup repair to get into the command prompt and executed the following commands. It assumes that the original Windows system disk is mounted as D:.
reg load HKLM\OFFLINE D:\Windows\System32\Config\SYSTEM
reg add "HKLM\OFFLINE\ControlSet001\Services\atapi" /v Start /t REG_DWORD /d 0 /f
reg add "HKLM\OFFLINE\ControlSet001\Services\intelide" /v Start /t REG_DWORD /d 0 /f
reg unload HKLM\OFFLINECloudflare malware blocking DNS
They also have adult content blocking see Cloudflare blog for details.
- 1.1.1.2
- 1.0.0.2
- 2606:4700:4700::1112
- 2606:4700:4700::1002
MacOS lock / unlock times
You can find lock / unlock times in log using terminal. The script below searches for records in last 8 hours, but you may change it using --last parameter. See lockunlock for details.
log show --last 8h --style syslog \
--predicate 'process == "loginwindow"' | grep -iE "user is active, releasing the activity semaphore|going inactive, create activity semaphore"Bitwarden SSH Agent from WSL
So you already use Bitwarden as OpenSSH agent in Windows. In WSL you may also use ssh.exe and ssh-add.exe as alternatives to ssh / ssh-add.
Just add the following aliases to your ~/.bashrc:
alias ssh='ssh.exe'
alias ssh-add='ssh-add.exe'