Powershell scriping excercise Nr.1

Added:
1. File extension filtered file-counter.
2. System-info display script (OS, CPU, RAM).
3. File listing script.
4. Filtered file renaming script by pattern.
5. Start of to-do-text-file for next commit.

1 - Basics/count-files-of-specific-type.ps1

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+# Call 'Get-ChildItem' cmdlet method to retrieve filesystem objects. 
+# './' specifies current directory. 
+# '-Recurse' instructs iterations through subdirectories. 
+# '-File' returns results for files only, no directories.
+# '-Filter' returns results for specified string pattern.
+
+Get-ChildItem -Path "./" -Recurse -File -Filter *.ps1  

1 - Basics/display-system-info.ps1

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+# Calling 'Get-ComputerInfo' method to return all computer information.
+Get-ComputerInfo | 
+# Calling 'Select-Object' method to filter results through '-Property' parameters.
+Select-Object -Property WindowsProductName, OSDisplayVersion, CsProcessors, OsTotalVisibleMemorySize

1 - Basics/list-files-in-folder.ps1

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+# Call 'Get-ChildItem' cmdlet method to retrieve filesystem objects. 
+# './' specifies current directory. 
+# '-Recurse' instructs iterations through subdirectories. 
+# '-File' returns results for files only, no directories. 
+
+Get-ChildItem -Path './' -Recurse -File |
+
+    # Call 'Select-Object' cmdlet method to return specified properties.
+    # '-Property FullName' returns full String path for each object.
+    # '-Property LastWriteTime' returns DateTime for last modification.
+
+    Select-Object -Property FullName, LastWriteTime |
+    
+    # Call 'Export-Csv' cmdlet method to convert outputs into CSV file.
+    # '-Path './folderFiles.csv'' returns output of file in current directory.
+    # '-NoTypeInformation' supresses #TYPE metadata line.
+
+    Export-Csv -Path './folderFiles.csv' -NoTypeInformation

1 - Basics/rename-files-in-folder-by-pattern.ps1

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+# Calling 'Get-ChildItem' method for return of items in Folder.
+# "./" In current directory.
+# "-Filter *.PNG" Of the type PNG.
+
+Get-ChildItem "./" -Filter *.PNG |
+
+    # Calling 'ForEach-Object' loop method for iterating through returned files.
+    ForEach-Object {
+
+        # Declaring and defining $newName variable.
+        # Consisting of "{0}/$_.BaseName/Original Name" "_" "{1:D4}/$i/4-digit-counter" "{2}/$_.Extension/original extension"  
+        $newName = "{0}_{1:D4}{2}" -f $_.BaseName, $i, $_.Extension
+
+        # Calling 'Rename-Item" method returns updated filename.
+        Rename-Item $_.FullName -NewName $newName
+
+        # Increment counter.
+        $i++
+    }