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How to get uptime in Windows using PowerShell

If you need to monitor how long the machine has been up, or whether the machine rebooted by itself or someone has just rebooted the server for without any reason. Then getting the uptime of the machine or server is important.
PowerShell code below gets the uptime by using a command line and processing its output.
#==========================
#get the uptime and save to text file Invoke-command -ScriptBlock { net statistics server >c:\online.txt }  $xcmd = select-string -path "c:\online.txt" -Pattern "since" | select line |ft -hidetableheaders  write-output $xcmd | out-file c:\online1.txt  $stry = get-content c:\online1.txt | out-string  $concatString = $stry.Substring(18,15) Write-host  $concatString
#Get the date $StartDate= [datetime] $concatString $EndDate= (GET-DATE) $xdate = NEW-TIMESPAN –Start $StartDate –End $EndDate write-output $xdate #==========================
Sample output:
Days              : 3 Hours             : 12 Minutes           : 12 Seconds           : 17 …

PowerShell registry keys basic operation

Working with registry keys is good and bad.
Good if you know exactly what you are doing, bad if you are just experimenting and you mess up the entire system.
Anyway, virtual machines will always save the day during test or experiment stage. Once everything is okay then deploy to the actual or production environment. If the test goes haywire, just trash the VM and start all over again.
Below are just simple and basic commands in PowerShell to query or get data from the registry.
This command below will list all the software listed on HKCU\Software path.
Get-ChildItem -Path HKCU:\Software
It’s quite useful to run it sometimes, so you will know what software is inside your system.
Below will list the user shell folders on the system.
Get-itemproperty 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders'
Sample output:
AppData                                : C:\Users\Administrator\AppData\Roaming Local AppData                          : C:\Users\Administrator\A…

PowerShell get folder capacity

Get the folder capacity using PowerShell via the old-school method.
Old-school since we will utilize the native “dir” command, just like the good old days of DOS.
PowerShell dir command output is not the same with the native windows system32 dir command line just like in DOS system.
The output will be in bytes since it is from the command line but of course, if you are command line junkie it will be easy to read even if the capacity is written in bytes.
First, fire up notepad write the dir command plus the full folder path of the specified folder in which you like to monitor or want to know the capacity.
 dir “c:\users\dmusic\music folder 001”
The path is enclosed in quotes since the folder has spaces and save the notepad as a batch file with “.bat” extension.
Open PowerShell command line window or PowerShell ISE and type the following command:
#change the path to where the batch file was saved
$folder_base_cap = d:\read_folder_cap.bat 
$ folder_base_cap | Select-String "bytes&qu…

PowerShell disable USB ports

Disabling USB ports using PowerShell by modifying registry values.
How to user PowerShell to modify an existing value in Windows Registry?
PowerShell code below modifies the registry value and disable USB ports in Windows.
The code must be run in an elevated mode to modify the registry.
Here's the code:
Modify the registry key value using PowerShell:
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\USBSTOR\" -Name "start" -Value 4
To enable the USB ports, change the value to 3:
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\USBSTOR\" -Name "start" -Value 3
Disabling USB ports is quite annoying of course, but if security is a concern then I guess it is justifiable especially computers that can easily be accessed by unwanted guests or individuals.

It will also protect the network or computers from getting malware's or viruses that is transferred or copied via USB storage.



Cheers! Till next time.


==============…

PowerShell validate list of email addresses

Validate list of email addresses in a text file and check which email is a valid email and which one has the incorrect format.
PowerShell code below can easily check or validate incorrect email, output will show true if valid email and false if the email is not valid.
To check list of valid emails PowerShell utilizes regex. This is useful to check typo errors when sending out mass email or a list of emails which has not yet been verified.

But of course, the code will not be able to check whether the emails are active or not.

#===============================
$reader = [System.IO.File]::OpenText("c:\all_emails.txt") #get-content can also be used
while($null -ne ($line = $reader.ReadLine())) {
    #$line     $regx="[a-z0-9!#\$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#\$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?"
    [regex]::Match($line, $regx, "IgnoreCase ")  |  format-Table success, value -AutoSize }

#========…

PowerShell search files/folder names with regex

Searching files with regex will come in handy provided you know the pattern you want to look for.
Searching for files that you don't have any clue or idea which one to find is such a dreadful situation.
Regex will help to filter files base on the pattern set from a fragmented memory due to multi-tasking world.
For example, you are quite sure that the file you're looking for starts with s and followed by letter k.
So files like skype_password.txt, skew animation.mp4, skbanner.logo, skin.css, skilled-listing.docx or any files that begins with "sk" will be filtered.
Here's the PowerShell code to do it:
#===================
$regx_filters = get-childitem "c:\all_files_n_rumble\" -recurse | where-object {$_.name -match '^s[k]' } Write-Output $regx_filters
#===================
To get folder or directory names with regex:
#===================
$regexPattern ="^l[i]" Get-ChildItem -Path "c:\all_folder_n_mixes\" -Recurse | Where-Object {$_.PS…

How to escape in PowerShell

In bash script the backslash is use as escape sequence and even in Java programming.

But what's the equivalent of bash escape sequence in PowerShell?

Grave accent or back tick, which is found at the top left corner of the keybord below the "esc" key on some keyboard, This character "`" is the escape in PowerShell.

For example:

Write-host "This line is above `r`n and  `r`n this line is below"

Output is:
This line is above
 and
 this line is below

r is equal to carriage return character putting a backtick before r, `r tells PowerShell that r is not a character but a carriage return
n is a new line character putting a backtick before n, `n tells PowerShell that n is a new line character.

Another example:

$ sign in PowerShell is to indicate a variable

But what if you need to display a dollar sign as a character and not as a special character to declare a variable. Then we need to escape the dollar sign by prefixing a backtick before the character.

Exampl…

PowerShell search text file contents

PowerShell code below will search recursively all text file on the path specified. If the pattern matches on the text file, the contents will be copied and all matching patterns will be consolidated on a single file.
#=============================
Get-ChildItem -Path "d:\all_text_files \" -recurse | ForEach-Object {
  @'
= = =>>>The file name - {0}
{1}
- - - - - - -
`r`n
'@ -f $_.Name, (Get-Content $_.FullName )
}  | Select-String -pattern "router" | Out-File 'd:\d_output\output.txt'
#=============================
Code explanation:
Get-ChildItem -Path "d:\txt notes\" -recurse | ForEach-Object  >>> Get all the items recursively on the path specified and for each object process each object
  @'  '@ >>> PowerShell string format that any text or string between the @ symbol will be process exactly as it is displayed, it’s like what you see is what you get.
{0} {1} >>> are place holders, in which the value w…

Use PowerShell to list installed programs

Do you need to check list of programs installed on remote computers?

PowerShell will come in handy to check list of installed software on remote computers.

Open PowerShell ISE or the PowerShell command line.

Make sure the PowerShell settings is configured to run PowerShell scripts.

Here's the PowerShell code snippet.

#for 64 bit
 #Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* |  Select-Object DisplayName, DisplayVersion, Publisher, InstallDate | Format-Table –AutoSize

#for 32 bit
 Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | where {$_.publisher -notmatch "^Microsoft"} | Select-Object DisplayName, DisplayVersion, Publisher, InstallDate | Format-Table –AutoSize

To get the list of non-Microsoft software installed on the computer:

Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | where {$_.publisher -notmatch "^Microsoft"} | Select-Object DisplayName, DisplayVersion, Publish…

PowerShell create active directory user

Create bulk users for Active Directory in PowerShell with the help of a text file or a CSV file can be done easily. But the code below is to create a single user account. The code below can easily be tweak by using for loop command and reading an external file where the data will be imported to PowerShell variables.
When I was creating this script, I encountered an error that says:
new-aduser attribute value was not in the acceptable range
Basically, the error is good and is useful as well. Since it already gives a hint that one of the value is not acceptable.
And on this case, it was the Country variable, I was writing the whole word “Philippines” when I changed it to PH and the error went away.
Here’s the code: #------Code Start--------  $Domain="@gui.local" $Firstname="Yorem" $Lastname="Goas" $Email="yorem.goas@gui.com" $Password="Wh@t!s1t0k" $Username=$Firstname +"."+ $Lastname $UPN=$Username+$Domain $DisplayName= "$Firstname…

PowerShell remove line feed

Line feed is useful in some ways like formatting lines so it will be easy to read if there’s a line in between the other line.
But there are also instances that line feed might be annoying or simply we need to get rid of it since it’s not desired on the output.
There instances that Out-string parameter in PowerShell will append a line feed on its output.
Or if you take the input or output from other sources but want to remove the line feed, PowerShell can remove the line feed without any hassle.
Code below is using PowerShell to remove line feed from an input, the input could either be a text file or a string pipe to another variable.
$string_with_line_feed -replace "`n|`r"
`n -  backtick with n refers to the line feed character `r – backtick with r refers to the carriage return
Or the code above can be written as follows:
$string_with_line_feed -replace "`n|"
So, basically line feed is replace with nothing. But for readability and to avoid confusion it’s better to …