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'"

Shell Script: Get the Average Grade of a Student

Write a shell script, which gives back the average grade of a student The student name we should give as a parameter! If you give a name that is not in the data file, please write out an error message and write out the list of the names (Just the names without the grades!!!) as a help!

input file: class.txt

Name/Math Informatics Literature English
Mohammed 3 4 5 4
Alan 2 1 3 2
Li 3 5 1 3
Jane 4 2 3 1

SCRIPT:

#!/bin/bash

# Variable Declaration
input_file="./class.txt"
name=$1
average=0
err_msg="\n\tPlease pass a student name to the script. \n\te.g.: ./average.sh Tom \n" 
name_list=`cat class.txt | awk '(NR != 1) {print $1}' | tr "\n" ","  | sed -e 's/,$//' -e 's/,/, /g' `
#---------------------------------------------------------------------------------------------
if [ -z "$name" ]
then
echo -e "$err_msg"
else
record=$(grep -w "$name" $input_file)
if [ -n "$record" ]
then
#sum=$(echo $a | awk '{sum=0; for (i=2; i<=NF; i++) { sum +=i} print sum }')
average=$(echo $record | awk '{sum=0; for (i=2; i<=NF; i++) { sum +=$i} print sum/(NF - 1) }')
echo -e "\t $name $average \n"
else
echo -e "No $name is in the list. There are: $name_list"
fi
fi

let's check the output: