How to replace of a specific line number

Question

I'm trying to replace line number 11 in a txt file using PowerShell.

Firstly I tried replacing a specific word, but it changed too much:

$output= (Resolve-DnsName -name name1).IPAddress 

(Get-Content "C:\test\test.txt") -replace "IPADDRESS=","IPADDRESS=$output"  | Set-Content C:\test\test.txt

It changes all lines witch word IPADDRESS= for exemple : line 5 serverIPADDRESS=0.0.0.0 line 8 computerIPADDRESS= line11 IPADDRESS= — mino
– mino, Commented Apr 20, 2017 at 12:51
OK. In that case, Martin Brandl's answer below is the simplest way to accomplish your aim. — Jeff Zeitlin
– Jeff Zeitlin, Commented Apr 20, 2017 at 12:52

henrycarteruk · Accepted Answer · 2017-04-20 13:12:21Z

10

If you want to replace something within a certain line, you can use the index operator on the string array that the Get-Content cmdlet returns:

$content = Get-Content "C:\test\test.txt"
$content[10] = -replace "IPADDRESS=","IPADDRESS=$output" 
$content | Set-Content C:\test\test.txt

edited Apr 20, 2017 at 13:12

henrycarteruk

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answered Apr 20, 2017 at 12:45

Martin Brandl

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4 Comments

jww Over a year ago

How can we do it as a one-liner that can be used in a Nmake file? Nmake needs simple commands, like mv a.txt b.txt.

Martin Brandl Over a year ago

You can just concat the lines with a semicolon ;-)

Wilhelm de Fheur Gorm Over a year ago

$content[10] = -replace "IPADDRESS=","IPADDRESS=$output" doesn't appear to work anymore -replace : The term '-replace' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name.

Giles Roberts Over a year ago

See @takeoff127 answer below if the above comment applies to you.

takeoff127 · Accepted Answer · 2020-06-21 10:51:40Z

3

For anyone finding that the above answer doesn't work for them, this works:

$content = Get-Content "C:\test\test.txt"
$contentUpdate = $content[10] -replace "IPADDRESS=","IPADDRESS=$output" 
Set-Content C:\test\test.txt $contentUpdate

answered Jun 21, 2020 at 10:51

takeoff127

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Comments

ouflak · Accepted Answer · 2022-02-10 12:09:56Z

0

$content = Get-Content "$file"
$content[$line - 1] = ($content[$line - 1] -replace "IPADDRESS=","IPADDRESS=$output")
Set-Content "$file" $content

This one worked for me.

edited Feb 10, 2022 at 12:09

ouflak

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answered Feb 10, 2022 at 11:23

ISHANSH LAL

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Comments

pwshsshd · Accepted Answer · 2022-12-27 23:35:28Z

0

PowerShell 7+
$output="127.0.0.1"

$content = Get-Content "C:\test\test.txt"

$content[10] =$content[10] -replace "IPADDRESS=","IPADDRESS=$output"

$content| Out-File "C:\test\test.txt"

answered Dec 27, 2022 at 23:35

pwshsshd

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