Get Current Location in Windows PowerShell and Linux

 When you are working on a Windows machine or Linux machine, you run your commands on a specific location. It is the location where you are presently inside, namely the current folder or directory.

How do you get the current location in Windows PowerShell?

Powershell uses the noun "Location"  to get the current directory or location. 

The command is "Get-Location"

Command:

 Get-Location

Output:

Path

----

C:\Users\chinm

How do you get the current location in Linux?

The command to get current location is : pwd  (present working directory)

PowerShell: Calculate the power using math function

 Here is a Powershell script 

• which gets two numbers from the command line 
• if there is no parameters, read them from the keyboard
• Calculate the power (first param on the power of the second )
• Display the output
  
• E.g. .\calcPower.ps1 2 3 => 8

 

PowerShell Script:

                    

#assign argument values
$num1 = $args[0]
$num2 = $args[1]

#check if the value entered is null
if ($num1 -like "$null"){
    #if null, ask for user input
    $num1 = read-host "Please enter the 1st number"
}

if ($num2 -like "$null"){
    $num2 = read-host "Please enter the 2nd number"
}

#calculate power using 'pow' function
$power = [Math]::Pow($num1,$num2)

#display output
Write-Output "$num1 to the power $Num2 is $power"

 

 

PowerShell Script: Copy Several files with same name to a folder without overriding with a differentiator

Powershell Script Description:

PowerShell script that will go through a directory called "C:\Deploy"

that has several subfolders with a file named "index.html in each of the subfolders and copy all the files named "index.html to a new folder called "C:\AllIndex" but not overwrite.

The files after copying would be named index001.html, index002.html, index003.html...

#source dir

$src = "C:\Deploy"

#destination dir 
$destn = "C:\AllIndex"

 

#Get the list of index.html
$index_html_list = (Get-ChildItem -Path "$src" -Name "index.html" -Recurse -Force)

 

# initialize counter
$counter = 1

 

#run in loop for all index.html 
foreach ($html in $index_html_list){
$counter = $counter.ToString('000')

#copy each index.html to new file in destination dir 
Copy-Item -Path "$src\$html" -Destination "$destn\index$counter.html"
#increment counter
$counter = [int]$counter + 1

}

 

PowerShell: Find the list of empty folders in a Directory

 

If you would like to find the empty folders in a directory you can use the below PowerShell script to find out.

Script:

$path = "D:\"   #change the value based on need

        #get the list of directories in the given path recursively  

         Get-ChildItem -Path $path -Directory -Recurse | ForEach-Object `

{ 

            #verify the count of files and folders in the directories are zero 

    if($_.GetFiles().Count -eq 0 -and $_.GetDirectories().Count -eq 0) 

        {

            "$($_.name)"            

        } 

} 

PowerShell: Check if the entered number is a valid Binary and print its decimal value

Powershell Script Description: 

Pass a number to a PowerShell script as an argument and validate whether it is a valid Binary. If the entered number is a valid binary, display its decimal value.

Script: isValidBinary.ps1

if (  $args[0] ){

    $num = $args[0]

    try {

        $value = [convert]::ToInt32(“$num”,2)

        Write-Host "'$num' is a valid Binary" -ForegroundColor Green

        Write-host "Decimal Value: $value"

        }

    catch{

        Write-Host  "'$num' is not a valid Binary" -ForegroundColor Red

    }

}

else{

    Write-Host "You must pass a number to the script"

}

Output:

 

Shell Script that accepts a positive integer and returns comma separated list of integers in descending order

Description: 

Write a  shell script that accepts exactly 1 argument which must be a positive integer. 

The script will print a comma-separated list of integers, all on the same line in descending order

Script: decreaseNum.sh

 

#!/bin/bash

#-----------------------------------------------

#user input

num=$1

temp=''

         

        #continue while input is greater than 0
 while [ $num -gt 0 ]
 do

                #append the numbers in decreasing order with comma-separated
  temp+="$num, "
  num=$(( $num - 1 ))
    done
 temp=$(echo $temp | sed 's/,$//')

 echo $temp

Output:

PowerShell Script to calculate letter count in a string

 Count occurrence of a letter in a string using Powershell:

Instruction:

1. Create a Powershell script that accepts two arguments

2. argument 1: a string

3. argument 2: a letter

Script: letterCount.ps1

$word = $args[0]
$letter = $args[1]
$count = 0
if ( $word -like $null -or $letter -like $null){
Write-Host "Argument missing" -ForegroundColor Green
break
}
$len = $word.length
foreach ($i in 0..$len){
     $a = $word[$i]
     if ( $a -like "$letter"){
        $count = $count + 1
     }
}
Write-Output "'$word' has $count '$letter'"