Tomoya's Blog

Memo for using Powershell

June 25, 2020 • ☕️ 3 min read

Hi, I’m Tomoya.
It’s been a while since I posted last time.
This time I’ll be writing about Powershell because I’ve been working on writing scripts with Powershell recently. It will be just a personal memo tho.

About Powershell

  • Shell script initially developed by Microsoft
  • Successor from DOS and VBScript, and based on .NET framework,
  • Works not only on Windows but also on Linux and MacOS


  • If Windows, it’s already installed by default.
  • If Mac, you can easily install Powershell here(it’s all Japanese tho)

In terms of text editor, Powershell ISE is one of the best choices in general. However, I’ll use Visual Studio code because I’m used to it and able to do similar things on VS code too, with Powershell extension which works like IDE for Powershell.

How to run Powershell scripts

File extension for Powershell is .ps1. Let’s just execute hello_world.ps1 which just outputs “Hello world!“.

# hello_world.ps1

write-host Hello world!

You created the file, and run it on terminal with just file name.

# terminal

hello_world.ps1 (you can omit ps1)

# output
Hello world!

How to write scripts

Powershell commands(commandlet)are basically consist of {Verb - Noun}.
And luckily Powershell commands have alias for Linux and MacOS commands as well so you can use something like ls on Powershell.

Basic commands

Powershell Linux、MacOS What it does
Get-Location pwd Get current directory’s path
Set-Location/Push-Location/Pop-Location cd Change current directory
New-Item touch Create a new file
New-Item -Type Directory mkdir Create a new directory
Get-ChildItem ls Show a list of files
Remove-Item rm Remove a file or directory
Copy-Item cp Copy a file or directory
Move-Item mv フMove a file or directory
Rename-Item mv Rename a file or directory
Get-Content cat/less Show a content of a file

More commands for scripting

To write more practical scripts, you need to understand and make use of complicated commands.


This command outputs a result of shell commands to another file.
(-encoding for charset, -append for appending to a remaining file)

"abcdefg" | Out-File sample.txt -encoding UTF8 -append

# If the path already defined, you can write a script like this too
$newFile = ‘c:\tmp\sample.txt’
"abcdefg" > $newFile


This command splits a remaining path and return a part of it. (-Parent for parent path -Leaf for a path at tip)

Split-Path -Parent C:\Folder1\Folder2\FileA.txt

# output

Split-Path -Leaf C:\Folder1\Folder2\FileA.txt

# output


This shows a message window and return a value that users choose.

# You need to load Assembly
Add-Type -AssemblyName System.Windows.Forms

# Ask question here
$result = [System.Windows.Forms.MessageBox]::Show("実行しますか?","確認","YesNo","Question","Button2")

# Show the result
If($result -eq "Yes"){


This command extracts a specific string based on regex(Regular Expression).

$sourceFile = ‘C:\tmp\source.txt’
$regex = ‘\b[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}\b’
select-string -Path $sourceFile -Pattern $regex -AllMatches -Encoding default

There’re more other commands which I would be using in near future so I’ll just add those commands here on this post…


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Tomoya Sonokui

To output what I learn from things, and brush up both English & Japanese writing skills. 日々感じたことや学んだことを日本語と英語でアウトプットするための技術系ブログ