Powershell retrieving a variable from a text file

Question

Is there a way to read a text file C:\test.txt and retrieve a particular value?

ie file looks like this:

serverName=serv8496 midasServer=serv8194 

I want to set the value of a variable in my script in some way from this file eg:

$MidasServer= (from file midasServer value) 

I will not know the line number where the reference is.

Any way to do this?

Answer 1

Yes, read the file, split each line and assign the split result to the Name and Value parameters:

Get-Content file.txt | Foreach-Object{    $var = $_.Split('=')    New-Variable -Name $var[0] -Value $var[1] } 

Answer 2

If that is exactly how your file appears i.e. a list of key value pairs denoted with a equals sign then you should have a look at ConvertFrom-StringData which

converts a string that contains one or more key and value pairs into a hash table. Because each key/value pair must be on a separate line, here-strings are often used as the input format.

So if a text file contained just the data in your example you could do this to create a hashtable

$Path = "C:\temp\test.txt" $values = Get-Content $Path | Out-String | ConvertFrom-StringData $values.midasServer 

Where the $values.midasServer would have the value serv8194. No need to know where the properties are in respect to the file. Your input file can also have varying leading and trailing space around the equals sign which will give the exact same result.

Depending on your use case you can take that one step farther and create a custom object from that hashtable

New-Object -TypeName pscustomobject -Property $values 

If you have at least PowerShell v3 or higher you can simplify the process (assuming you want a custom psobject)

$values = [pscustomobject](Get-Content $Path -Raw | ConvertFrom-StringData) $values.midasServer