Day 20 - PowershELlF to the rescue

Date: 20, December, 2020

Author: Dhilip Sanjay S

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Powershell

• PowerShell is built on top of the .NET Common Language Runtime (CLR), and accepts and returns .NET objects

• Powershell cmdlets are case-insensitive.

  • Set-Location (cd)

  • Get-ChildItem (ls)

    • Some options that can be used:

      • -Path

      • -File / -Directory

      • -Filter

      • -Recurse

      • -Hidden

      • -ErrorAction SilentlyContinue

  • Get-Content (cat)

  • Measure-Object -Word (wc)

    • Can be piped: Get-Content -Path file.txt | Measure-Object -Word

  • To get the exact position of a string within a file: (Get-Content -Path file.txt)[index]

  • To search a particular file for a pattern: Select-String

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Solutions

Search for the first hidden elf file within the Documents folder. Read the contents of this file. What does Elf 1 want?

• Answer: 2 front teeth

• Steps to Reproduce:

  PS C:\Users\mceager> Set-location Documents 
  PS C:\Users\mceager\Documents> Get-ChildItem -File -Hidden  
  
  
      Directory: C:\Users\mceager\Documents
  
  
  Mode                LastWriteTime         Length Name
  ----                -------------         ------ ----
  -a-hs-        12/7/2020  10:29 AM            402 desktop.ini
  -arh--       11/18/2020   5:05 PM             35 e1fone.txt
  
  
  PS C:\Users\mceager\Documents> Get-content e1fone.txt 
  All I want is my '2 front teeth'!!!
  

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Search on the desktop for a hidden folder that contains the file for Elf 2. Read the contents of this file. What is the name of that movie that Elf 2 wants?

• Answer: Scrooged

• Steps to Reproduce:

  PS C:\Users\mceager> Set-Location Desktop
  PS C:\Users\mceager\Desktop> Get-Childitem -Hidden 
  
  Directory: C:\Users\mceager\Desktop
  Mode                LastWriteTime         Length Name
  ----                -------------         ------ ----
  d--h--        12/7/2020  11:26 AM                elf2wo
  -a-hs-        12/7/2020  10:29 AM            282 desktop.ini
  
  PS C:\Users\mceager\Desktop> Set-Location elf2wo
  PS C:\Users\mceager\Desktop\elf2wo> Get-Childitem -File
  
  
  Directory: C:\Users\mceager\Desktop\elf2wo
  
  
  Mode                LastWriteTime         Length Name
  ----                -------------         ------ ----
  -a----       11/17/2020  10:26 AM             64 e70smsW10Y4k.txt
  
  
  PS C:\Users\mceager\Desktop\elf2wo> Get-content .\e70smsW10Y4k.txt
  I want the movie Scrooged <3!

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Search the Windows directory for a hidden folder that contains files for Elf 3. What is the name of the hidden folder? (This command will take a while)

• Answer: 3lfthr3e

• Steps to Reproduce:

  PS C:\>Set-Location Windows\System32
  PS C:\Windows\System32> Get-ChildItem -Directory -Hidden -Filter "*3*"
  
  
  Directory: C:\Windows\System32
  
  
  Mode                LastWriteTime         Length Name
  ----                -------------         ------ ----
  d--h--       11/23/2020   3:26 PM                3lfthr3e

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How many words does the first file contain?

• Answer: 9999

• Steps to Reproduce:

  PS C:\Windows\System32> Set-Location .\3lfthr3e\
  PS C:\Windows\System32\3lfthr3e> Get-Childitem -Hidden
  
  
      Directory: C:\Windows\System32\3lfthr3e
  
  
  Mode                LastWriteTime         Length Name
  ----                -------------         ------ ----
  -arh--       11/17/2020  10:58 AM          85887 1.txt
  -arh--       11/23/2020   3:26 PM       12061168 2.txt
  
  PS C:\Windows\System32\3lfthr3e> Get-Content 1.txt | Measure-Object -Word
  
  Lines Words Characters Property 
  ----- ----- ---------- --------
      9999
  

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What 2 words are at index 551 and 6991 in the first file?

• Answer: Red Ryder

• Steps to Reproduce:

  PS C:\Windows\System32\3lfthr3e> (Get-Content 1.txt)[551]
  Red
  
  PS C:\Windows\System32\3lfthr3e> (Get-Content 1.txt)[6991]
  Ryder 
  
  PS C:\Windows\System32\3lfthr3e> (Get-Content 1.txt)[551,6991]
  Red
  Ryder
  
  PS C:\Windows\System32\3lfthr3e> Get-Content 1.txt | Select-Object -Index 551,6991
  Red
  Ryder

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This is only half the answer. Search in the 2nd file for the phrase from the previous question to get the full answer. What does Elf 3 want? (use spaces when submitting the answer)

• Answer: red ryder bb gun

• Steps to Reproduce:

  PS C:\Windows\System32\3lfthr3e> Select-String 2.txt -Pattern 'redryder'
  
  2.txt:558704:redryderbbgun
  
  PS C:\Windows\System32\3lfthr3e> Get-Content 2.txt | Select-String -Pattern 'redryder'
  
  redryderbbgun 

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