PowerShell Regex - How to remove everything after first line?

Obsolesce

I have something like the following:

First line of stuff

There's a line of text, followed by a few blank lines.

I'm looking for a regex to delete everything after the first line, leaving only:

First line of stuff

So far, I have found that

^(.*)

selects only the first line. That doesn't work, i'm looking to use something like this in Powershell:

$variable1 = $variableA -replace <regexStatement)

Where, <regexStatement>,'' selects everything after the first line, and the comma and two tics after that replaces it with "nothing".

Obsolesce

To simplify, all I need is a regex statement that selects everything after the 1st line. I got the rest.

stacksofplates

Too bad it’s Powershell. I could help you with sed.

sed ‘1!d’ file

Obsolesce

I figured out a better way to do it, without using RegEx:

$compName = Get-WmiObject win32_ComputerSystem | Select-Object -ExpandProperty Name
if ($compName -match "WINDOWS") {
$dellTag = Get-WmiObject win32_bios | Select-Object -ExpandProperty SerialNumber
Rename-Computer -NewName $dellTag -Restart
}

What I was originally trying to do, I also figured out... by avoiding having to select new lines. I outputted the info to a text file first, and then I searched for a pattern, putting that into a variable, in which I could then just remove everything before the :<space>. Then I was left with the same result as above:

$compName = Get-WmiObject win32_ComputerSystem | Select-Object -ExpandProperty Name
if ($compName -match "WINDOWS") {
$dtFile = "C:\dellTag.txt"
$snList = Get-WmiObject win32_bios | FL SerialNumber
$snList > $dtFile
$dtFilter = Select-String -Pattern "SerialNumber" -Path $dtFile
$dellTag = $dtFilter -replace '^[^_]*: ',''
Remove-Item $dtFile
Rename-Computer -NewName $dellTag -Restart
}

I got the RegEx idea from a previous script I made to comb through a log file. In that case I needed to use RegEx, but in this case, I could get what I needed more simply through PowerShell.

dbeato

@tim_g said in Regex - How to remove everything after first line?:

I figured out a better way to do it, without using RegEx:
$compName = Get-WmiObject win32_ComputerSystem | Select-Object -ExpandProperty Name
if ($compName -match "WINDOWS") {
$dellTag = Get-WmiObject win32_bios | Select-Object -ExpandProperty SerialNumber
Rename-Computer -NewName $dellTag -Restart
}
What I was originally trying to do, I also figured out... by avoiding having to select new lines. I outputted the info to a text file first, and then I searched for a pattern, putting that into a variable, in which I could then just remove everything before the :<space>. Then I was left with the same result as above:
$compName = Get-WmiObject win32_ComputerSystem | Select-Object -ExpandProperty Name
if ($compName -match "WINDOWS") {
$dtFile = "C:\dellTag.txt"
$snList = Get-WmiObject win32_bios | FL SerialNumber
$snList > $dtFile
$dtFilter = Select-String -Pattern "SerialNumber" -Path $dtFile
$dellTag = $dtFilter -replace '^[^_]*: ',''
Remove-Item $dtFile
Rename-Computer -NewName $dellTag -Restart
}
I got the RegEx idea from a previous script I made to comb through a log file. In that case I needed to use RegEx, but in this case, I could get what I needed more simply through PowerShell.

SO you wanted to get the service tag correct? WIthout Powershell it would been
wmic bios get serialnumber

coliver

Could also do this one for Powershell.

get-wmiobject -class win32_bios | Select serialnumber

scottalanmiller

Modified the title as this is specific to PowerShell.

Obsolesce

Actually, I'm sticking to this:

$compName = Get-WmiObject win32_ComputerSystem | Select-Object -ExpandProperty Name
if ($compName -match "WINDOWS") {
$dellTag = Get-WmiObject win32_bios | Select-Object -ExpandProperty SerialNumber
Rename-Computer -NewName $dellTag -Force -Restart
}
Exit

travisdh1

@tim_g said in PowerShell Regex - How to remove everything after first line?:

Actually, I'm sticking to this:

$compName = Get-WmiObject win32_ComputerSystem | Select-Object -ExpandProperty Name
if ($compName -match "WINDOWS") {
$dellTag = Get-WmiObject win32_bios | Select-Object -ExpandProperty SerialNumber
Rename-Computer -NewName $dellTag -Force -Restart
}
Exit

Compared to sed, that makes my head hurt. Glad you got it sorted, and an example for when I'll need to do the same thing.