1. Proxy setting

Windows

set HTTP_PROXY=http://user:password@127.0.0.1:10809 or set HTTP_PROXY=http://127.0.0.1:10809
set HTTPS_PROXY=http://user:password@127.0.0.1:10809 or set HTTPS_PROXY=http://127.0.0.1:10809

python pip

pip install -r ./requirements.txt -i https://pypi.douban.com/simple --trusted-host=pypi.douban.com
pip3 install numpy -i https://pypi.douban.com/simple

Go download

go env -w GOPROXY=https://goproxy.cn

Note: If Makefile set GOPROXY by export GOPROXY ?= https://proxy.golang.org, Be sure comment it.

conda download

conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/msys2/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/
conda config --set show_channel_urls yes

npm download

npm config get registry
npm config set registry https://registry.npm.taobao.org
npm config set registry https://registry.npmjs.org (Note: used for set back)

git bash download

git config --global https.proxy "https://127.0.0.1:10808"

download video

https://bilibili.iiilab.com/

2. Useful command

Change suffix

rename ‘s/.csv/.txt/’ *

Vi delete a line

Linux convert all the .md file to .html file

for i in *.md ; do echo “$i” && pandoc -s $i -o $i.html ; done

Linux rename multiple files

for example: rename aro_tty-mIF-45875564pmo_opt to aro_tty-mImpFRA-45875564pmo_opt

for file in aro_tty-mIF-*_opt;do mv -i "${file}" "${file/-mIF-/-mImpFRA-}";done

ref:

https://unix.stackexchange.com/questions/102647/how-to-rename-multiple-files-in-single-command-or-script-in-unix

Nmap scan port

nmap 192.168.1.1 -p1-65535

vi copy a line

vi past a line

add and remove library from executable file

patchelf --remove-needed libhello.so.1 hello  
patchelf --add-needed ./libhello.so.1 hello

Linux lists all open files

lsof

Show Files Accessed by Network Connections

sudo lsof -i

Linux show all used tcp and udp port

sudo netstat -tunlp

Install specifical gem package

sudo gem install rack -v “2.2.4”

vi append just after the current cursor position

Linux edit hosts file

sudo vi /etc/hosts

clone a specific directory from Github

Replace tree/master with trunk, so download https://github.com/torvalds/linux/tree/master/net/mac80211 would be:
```
svn checkout https://github.com/torvalds/linux/trunk/net/mac80211
```
Replace tree/v5.13 with tags/v5.13, so download https://github.com/torvalds/linux/tree/v5.13/net/mac80211 would be:
```
svn checkout https://github.com/torvalds/linux/tags/v5.13/net/mac80211
```

gcc link openssl

gcc XXX.c -lcrypto -lssl

gcc not show warning

gcc XXX.c -w

Ruby 3 encode url

str = URI.encode_www_form_component(str)

ref:

https://rubyapi.org/3.1/o/uri#method-c-encode_www_form_component

Ruby 3 Encoding

string.force_encoding(Encoding::UTF_8)

ref:

https://rubyapi.org/3.1/o/encoding

C language convert integer to string

sprintf(string, “%04d”, integer);

Linux not delete all the .txt files

rm !(*.txt)

windows powershell processing all the file in a directory

foreach($file in (Get-ChildItem .\subdirectory).Fullname) {echo $file}

windows find exe file link library

dumpbin /dependents nm.exe

windows find dll library info

dumpbin /headers nm.dll

windows exports symbol from library

static lib DUMPBIN /SYMBOLS static.lib
shared dll or import lib DUMPBIN /EXPORTS shared.dll/import.lib

Note: If not display symbols, the lib may not export symbols when creating.

Linux check OpenCV version

pkg-config opencv4 --modversion

Path With Spaces in PowerShell

Use Single Quotes ‘ ‘ to Deal With Spaces in the Path in PowerShell

Ubuntu install specific version package

apt list --all-versions package_name
sudo apt install package_name=package_version

Run PowerShell script

set-ExecutionPolicy RemoteSigned
powershell.exe sh.ps1

ref:

https://learn.microsoft.com/zh-cn/powershell/module/microsoft.powershell.core/about/about_execution_policies?view=powershell-7.2

windows edit sql .dat file

https://sqliteexpert.com/download.html

crack rar file (6 digit number)

.\rar2john.exe file.rar
.\hashcat.exe -a 3 -m 13000 –force ‘$rar5$16$bebb59a9f3408812c93cd3c9d074278b$15$3d7fdb029cd967b7342f13bdcfa94938$8$f1cc239aa078d2d2’ ?d?d?d?d?d?d

Linux Create Files Of A Certain Size

truncate -s 5M ostechnix.txt (data format)
yes > file.txt; truncate -s 1M file.txt (ASCII format)
dd if=/dev/urandom of=ostechnix.txt bs=5MB count=1 (random data)

ref:

https://ostechnix.com/create-files-certain-size-linux/

Linux display binary file

hd file

Linux add content to file header

sed -i ‘1s/^/This is my header\n/’ filename

Windows: Equivalent to linux time command

Measure-Command {start-process yourCommand.exe -argumentlist "argument1 argument2" -wait}

git clone a tag to repo

git clone -b <tagname> --single-branch <repository> .
git remote set-url origin [new-url]
git branch <new-branch>
git push origin heads/<new-branch>

ref:

Windows set env only affects current shell

set PATH=%PATH%;C:\your\path\here\

Windows Powershell show env

echo $Env:PATH

ref:

https://superuser.com/questions/341192/how-can-i-display-the-contents-of-an-environment-variable-from-the-command-promp

Check Disk Space in Linux

df -h

ref:

https://phoenixnap.com/kb/linux-check-disk-space

Linux set time

sudo timedatectl set-time "YYYY-MM-DD HH:MM:SS"

Linux enable ssh service

sudo systemctl enable ssh.service
sudo systemctl is-enabled ssh.service

Linux show battery info

upower -i /org/freedesktop/UPower/devices/battery_BAT0

Linux allow port through firewall

sudo apt-get install ufw
sudo ufw allow 22
sudo ufw enable
sudo ufw status
sudo ufw allow to 192.168.1.0/24
sudo ufw allow from 192.168.1.0/24 to any port 22

ref:

https://serverfault.com/questions/74023/ufw-on-ubuntu-to-allow-all-traffic-on-lan

Linux get all files size of directory

du -sh /path/to/directory

Windows create directory link

mklink /j linkDir TargetDir

VSCode multiline selection

shift + alt

ref:

https://superuser.com/questions/1503953/vscode-multiline-select-how-to-delete-without-removing-blank-lines

Windows restore ESP partition to EFI

diskpart

list disk
select disk 0
list partition
select partition 1
set id=C12A7328-F81F-11D2-BA4B-00A0C93EC93B

Linux sort all directories and files based on their size

du -sh -- * | sort -rh

ref:

https://unix.stackexchange.com/questions/106330/sort-all-directories-based-on-their-size

Windows Linux sort all directories and files based on their size

https://windirstat.net/

Package Management for MINGW64

Start MING64

open git bash as admin

Finding a package

pacman -Ss <name or part of the name of the package>

Installing a package

pacman -S <name of the package>

Uninstalling a package

pacman -R <name of the package>

Update to fix problem(invalid or corrupted package)

pacman -Syu

ref:

https://www.msys2.org/docs/package-management/

MINGW64 use cmake

install cmake

pacman -S cmake

check generator

cmake -E capabilities

install generator

pacman -S ninja

build

mkdir build && cd build
cmake -G Ninja <path-to-source> -DCMAKE_BUILD_TYPE=Release
cmake --build .

ref:

https://www.msys2.org/docs/cmake/

Copy all deps to a directory

ldd exe | grep "c/vcpkg" | awk '{print $3}' | xargs cp -t ./package

Linux show GPU VRAM

sudo dmesg | grep drm

Linux display memory usage

free -m

Fix Python UnicodeEncodeError: ‘gbk’ codec can’t encode character

str.encode('utf-8').decode('gbk')(first convert string to byte string(utf-8), then convert back to string(gbk))

Curl download multiple files

curl -O https://example.com/file[1-10].png

ref:

https://unix.stackexchange.com/questions/243134/curl-download-multiple-files-with-brace-syntax

Useful code

convert from `int` to the `string` in C++

#include <string> 

std::string s = std::to_string(42);
int i = std::stoi("45");

ref:

https://stackoverflow.com/questions/5590381/how-to-convert-int-to-string-in-c

write lines to a file in C++

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main (){
    ofstream myfile("CSC2134.txt");

    if(myfile.is_open())
    {
        string str;
        do{
            getline(cin, str);
            myfile<<str<< endl;
        }while(str!="");
        myfile.close();
    }
    else cerr<<"Unable to open file";

    return 0;
}

windows call dll in C++

#include <windows.h>
#include <iostream>

/* Define a function pointer for our imported
 * function.
 * This reads as "introduce the new type f_funci as the type: 
 *                pointer to a function returning an int and 
 *                taking no arguments.
 *
 * Make sure to use matching calling convention (__cdecl, __stdcall, ...)
 * with the exported function. __stdcall is the convention used by the WinAPI
 */
typedef int (__stdcall *f_funci)();

int main()
{
    HINSTANCE hGetProcIDDLL = LoadLibrary("path/to/dll");

    if (!hGetProcIDDLL) {
        std::cout << "could not load the dynamic library" << std::endl;
        return EXIT_FAILURE;
    }

    // resolve function address here
    f_funci funci = (f_funci)GetProcAddress(hGetProcIDDLL, "setup");
    if (!funci) {
        std::cout << "could not locate the function" << std::endl;
        return EXIT_FAILURE;
    }
        
    std::cout << "funci() returned " << funci() << std::endl;
    FreeLibrary(hGetProcIDDLL);
    return 0;
}

ref:

https://stackoverflow.com/questions/8696653/dynamically-load-a-function-from-a-dll

call python in C++

#include "Python.h"
    // c++ call python example
    Py_SetPythonHome(L"path/to/python3_x64-windows/tools/python3");
    Py_Initialize();
    PyRun_SimpleString("import os");
    PyRun_SimpleString("print ('Python example')");
    // call this function will destory all python context
    Py_Finalize();

Predefined C/C++ macros for cross-platform development

#if defined(__linux__)
#include <unistd.h>
#elif _WIN32
#include <windows.h>
// fix windows min, max macro
#ifdef max
#undef max
#endif
#ifdef min
#undef min
#endif
#endif

ref:

https://dev.to/tenry/predefined-c-c-macros-43id

Cross-platform development

#if defined(__linux__)
        sleep(dt);
#elif _WIN32
        Sleep(dt*1000);
#endif

https://github.com/win32ports

Useful link

music link

English dictionary link

neural network link

free mail

https://www.guerrillamail.com/

https://gofile.io/

build, test and debug regex

https://regex101.com/

Download pdf and book

find doi link by https://www.researchgate.net
download pdf by https://sci-hub.usualwant.com/
download book by https://libgen.rs

sunny_33

1. Proxy setting

Windows

python pip

Go download

conda download

npm download

git bash download

download video

2. Useful command

Change suffix

Vi delete a line

Linux convert all the .md file to .html file

Linux rename multiple files

Nmap scan port

vi copy a line

vi past a line

add and remove library from executable file

Linux lists all open files

Show Files Accessed by Network Connections

Linux show all used tcp and udp port

Install specifical gem package

vi append just after the current cursor position

Linux edit hosts file

clone a specific directory from Github

gcc link openssl

gcc not show warning

Ruby 3 encode url

Ruby 3 Encoding

C language convert integer to string

Linux not delete all the .txt files

windows powershell processing all the file in a directory

windows find exe file link library

windows find dll library info

windows exports symbol from library

Linux check OpenCV version

Path With Spaces in PowerShell

Ubuntu install specific version package

Run PowerShell script

windows edit sql .dat file

crack rar file (6 digit number)

Linux Create Files Of A Certain Size

Linux display binary file

Linux add content to file header

Windows: Equivalent to linux time command

git clone a tag to repo

Windows set env only affects current shell

Windows Powershell show env

Check Disk Space in Linux

Linux set time

Linux enable ssh service

Linux show battery info

Linux allow port through firewall

Linux get all files size of directory

Windows create directory link

VSCode multiline selection

Windows restore ESP partition to EFI

Linux sort all directories and files based on their size

Windows Linux sort all directories and files based on their size

Package Management for MINGW64

Start MING64

Finding a package

Installing a package

Uninstalling a package

Update to fix problem(invalid or corrupted package)

MINGW64 use cmake

install cmake

check generator

install generator

build

Copy all deps to a directory

Linux show GPU VRAM

Linux display memory usage

Fix Python UnicodeEncodeError: ‘gbk’ codec can’t encode character

Curl download multiple files

Useful code

convert from int to the string in C++

write lines to a file in C++

windows call dll in C++

call python in C++

Predefined C/C++ macros for cross-platform development

convert from `int` to the `string` in C++