CODEWITHSUNDEEP
listpowershellparametersscriptingparameter-passing
Francesco Mantovani
Francesco Mantovani

Reputation: 12297

PowerShell :: input a list as param

In the same directory I have 2 files:

my test.ps1 contains this code:

param(
    $Servers = get-content -Path "Servers.txt"
    ForEach($Server in $Servers) {
        $instance = $Server}
)

As soon as I try to run it I incur in the error:

At C:\test.ps1:2 char:15
+     $Servers = get-content -Path "Servers.txt"
+               ~
Missing expression after '='.
At C:\test.ps1:2 char:13
+     $Servers = get-content -Path "Servers.txt"
+             ~
Missing ')' in function parameter list.
At C:\test.ps1:5 char:1
+ )
+ ~
Unexpected token ')' in expression or statement.
    + CategoryInfo          : ParserError: (:) [], ParseException
    + FullyQualifiedErrorId : MissingExpressionAfterToken

Which is very odd as the code is so simple.

The goal is to input a list of server names that I'm later going to parse.

Any help?

Upvotes: 0

Views: 1976

Answers (1)

mklement0
mklement0

Reputation: 439193

To use output from a command (as opposed to an expression) as a parameter variable's default value, you must convert it to an expression with (...), the grouping operator:

# Parameter declarations
param(
    $Servers = (get-content -Path "Servers.txt")
)

# Function body.
ForEach($server in $Servers) {
  $instance = $server
}

Note: Use of $(...), the subexpression operator, is only required if the default value must be determined via multiple commands (or whole statement(s), such as foreach or while loop).

Upvotes: 2

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