This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.
Step 1 - Enable NBD on the Host
modprobe nbd max_part=8
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| obj-m += tcp_svr_sample.o | |
| all: | |
| make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules | |
| clean: | |
| make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clea |
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| adb shell am | |
| usage: am [subcommand] [options] | |
| usage: am start [-D] [-W] [-P <FILE>] [--start-profiler <FILE>] | |
| [--R COUNT] [-S] [--opengl-trace] <INTENT> | |
| am startservice <INTENT> | |
| am force-stop <PACKAGE> | |
| am kill <PACKAGE> | |
| am kill-all | |
| am broadcast <INTENT> | |
| am instrument [-r] [-e <NAME> <VALUE>] [-p <FILE>] [-w] |
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| /* please refer better example: https://github.com/dvdhrm/docs/tree/master/drm-howto/ */ | |
| #define _XOPEN_SOURCE 600 | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #include <sys/mman.h> | |
| #include <fcntl.h> | |
| #include <unistd.h> | |
| #include <xf86drm.h> |
ddre54
/ changing_time_zones.sh
Last active
September 26, 2025 08:46
Mac OS X - Terminal commands for changing time zones in the machine
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| # Useful for testing things that are time zone | |
| # sensitive - like scheduling things | |
| # Get current timezone | |
| sudo systemsetup -gettimezone | |
| # Get list of available timezones | |
| sudo systemsetup -listtimezones | |
| # Set the timezone to the selected timezone |
tsrivishnu
/ gitignore_already_tracked_file.md
Last active
July 17, 2025 10:52
Git: Ignore already checked in file
You have a repo and quite some developers have cloned the repo and working on it. Now you want to add a file to gitignore which is already checked-in or tracked by Git.(The file is already commited into the repo)
Below are the steps on how to ignore this file (lets say the filename is config.py):
-
Add it to
.gitignore:
$ echo "config.py" >> .gitignore
Miouyouyou
/ drm-prime-dumb-kms.c
Last active
October 25, 2024 06:17
Simple example showing how to use DRM to : allocate a Dumb buffer on the GPU, use it as a framebuffer, use this CRTC on the currently connected screen (expecting 1 connected screen), export the buffer, reimport it implicitly with mmap and write in it.
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| // This will works on Embedded GPU that implements .gem_prime_mmap like Rockchip ones. | |
| // This will fail on most DRM drivers for GPU with dedicated memory as they tend to NOT implement .gem_prime_mmap. | |
| #include <stdio.h> | |
| #include <libdrm/drm.h> | |
| #include <stdint.h> | |
| #include <sys/mman.h> | |
| #include <string.h> |
mutin-sa
/ Top_Public_Time_Servers.md
Last active
October 26, 2025 15:29
List of Top Public Time Servers
linuxkathirvel
/ print-scr-key-to-flameshot-tool-in-gnome3.md
Last active
September 8, 2025 10:14
How to assign PrtScr(Print Screen) key to Flameshot screenshot tool in Gnome 3?
- Goto Keyboard settings and click 'Save a screenshot to Pictures' under 'Screenshots' section.
- Press 'Backspace' key delete 'PrtScr' key shortcut and press 'Set' button
- Press '+'(Plust) icon in the 'Custom Shortcuts' in the same window
- Enter 'Flameshot' in 'Name' field , 'flameshot gui' in 'Command' field, and click 'Set Shortcut' button and press 'PrtScr' button in the keyboard and close the dialog box 5.That's it. If you press 'PrtScr' key, the Flameshot selection area screen will appear.
Below are the steps to get an ARM64 version of Ubuntu running in the QEMU emulator on Windows 10.
Install for Windows from https://qemu.weilnetz.de/w64/ (I used qemu-w64-setup-20181211.exe)
Put C:\Program Files\qemu on your PATH, and run the below to check it's working (which will list out
the CPUs the AArch64 emulator can emulate):
qemu-system-aarch64 -M virt -cpu help
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