CheatSheet

Some references for tools.

The Missing Semester of Your CS Education

This is a good collections of lectures on tools that will get you started.

Scoop

This is quite cool to get unix cmds into windows 10 without a lof of unix knowledge. Using powershell felt as if a unix shell. Highly recommended for windows user. Some recommended packages:

~ $ scoop list
Installed apps:

  7zip 19.00
  anaconda3 2019.10 [extras]
  aria2 1.35.0-1
  dark 3.11.2
  gopass 1.8.6
  gpg 2.2.19
  grep 2.5.4
  lessmsi 1.6.91
  pshazz 0.2019.08.07
  vim 8.2
  which 2.20

if you install anaconda with scoop, run activate to activate the vistual python environment.

SSH

• To use ssh on 443 port, you can add the following in ~/.ssh/config

  Host github.com
    HostName ssh.github.com
    Port 443
    User git
    PreferredAuthentications publickey
  Host gitlab.com
    Hostname altssh.gitlab.com
    User git
    Port 443
    PreferredAuthentications publickey
  

• Copy ssh id

ssh -i ~/.ssh/mykey user@host

Git

• Gitlab git cheat sheet
• Use submoduels to have nested git repositories. ref

git clone --recursive [URL to Git repo]
git submodule update --init
git submodule update --init --recursive
git pull --recurse-submodules
git submodule update --remote

• Create a clean git history ref

git checkout --orphan temp_branch
git add -A
git commit -am "the first commit"
git branch -D master
git branch -m master
git push -f origin master

• Or Simply rebase the whole thing

git rebase -i --root
git push --force

• gitignore is used to avoid some file to be uploaded to repo

Learn Git

• diff local master with remote

git diff master origin/master

Dotnet CLI and Paket

• sometime vs run into build issues, and the cli provides a more consistent experience. To restore, build, test, publish etc. Paket is integrated smoothly, but you might need to run paket install before building the 1st time.

• use dotnet tool install paket globally

dotnet tool install paket --global

• Use paket to isntall/restore/update packages. Get started. To start from scratch if packages cannot be downloaded or installed properly, you can clear cache

paket install
paket update
paket clear-cache
dotnet restore
dotnet build -c Release
dotnet vstest Test.dll #run test on a prebuilt test dll
dotnet test --filter DisplayName~getPrice #run XunitTest with a filter
dotnet publish -c Release -o outputdir

• Use jupyter notebook for F#

For people familiar with jupyter notebook/lab, you can follow this guide and enable F# for it.

dotnet tool install --global Microsoft.dotnet-interactive
dotnet interactive jupyter install #from Anaconda console
jupyter kernelspec list

• for a even more controlled build process, use Fake

PowerShell

• create csv and select cloumns

(type .\navdb.csv | Select-String "," ) | ConvertFrom-Csv | select "Path","Frequency"

• add user path entry and remove duplicates adapted from this post.

$CurrentPath = [Environment]::GetEnvironmentVariable('Path','User')
$TargetPath = $CurrentPath+";path1"
$SplittedPath = $TargetPath -split ';'
$CleanedPath = $SplittedPath | Sort-Object -Unique
$NewPath = $CleanedPath -join ';'
[Environment]::SetEnvironmentVariable('Path', $NewPath,'User')

• delete directory by force

rm -r -fo somedir

• cmd to copy folder

  robocopy src des /MIR
  

or

xcopy /S src des

or

cp -Recurse -Force src dst

WSL

• add ca cert from windows to wsl’s mono

certmgr -ssl https://nuget.org
certmgr -ssl https://github.com

• mount network drive

sudo mkdir /mnt/f
sudo mount -t drvfs F: /mnt/f

Unix commands

• find files with certain pattern and run cmd on them, e.g. change dos to unix txt format for all .sh .vim and .py files.

find -iregex '.*\.\(sh\|vim\|py\)$' -exec dos2unix {} \;

• grep filename with contents in current directory and run some cmds on them via xargs.

grep -rl PATTERN  . | xargs ls -l

GPG

A useful cheat sheet

Selected common comands:

gpg --list-secret-keys 
gpg --export -a $ID > my-pub-key.asc
gpg --export-secret-keys -a $ID > my-private-key.asc
gpg --export-secret-subkeys -a $ID > my-private-subkey.asc
gpg --import private_or_pub_key.asc
gpg --delete-key 
gpg --delete-secret-key
#extend expiry requires secret key
gpg --edit-key $id
gpg> expire #key n
gpg> save
gpg> trust 
#encrypt file
gpg -ers $id file

GoPass

• Gopass is an password manager. Use it instead of pass for better functionality and windows integration.

gopass some_entry
gopass clone git_repo

wget

• download all jpg files from a reference page

wget -r -A .jpy url

imagemagick

• Command line tool to manipulate images, for example check image info, resize, crop and compress image.

magick convert test.jpg info:
magick convert test.jpg -thumbnail 300 -crop 300x100+0+150 -quality 82 test1.jpg