#Script créé par Nicolas Lang - Sous licence CC-BY-SA
#https://nicolaslang.fr


function Get-LinuxUsers
{
    [CmdletBinding(
        SupportsShouldProcess=$false,
        HelpUri="http://nicolaslang.blogspot.com"
    )]
    param(
        [Parameter (Position=0, ValueFromPipeline=$true)]
        [ValidateNotNullOrEmpty()]
        [string]$name,
        [Parameter (Mandatory=$false)]
        [ValidateNotNullOrEmpty()]
        [ValidatePattern('(?&ltpropertyname&gt(Name|Pass|ID_User|ID_Group|Comment|Home|Shell))\s+(?&ltoperator&gt(-like|-eq|-ceq|-clike))\s+"(?&ltvalue&gt.*)"')]
        [string]$filter,
        [Parameter (DontShow,ValueFromPipelineByPropertyName=$true)]
        [AllowNull()]
        $totallist
    )
    
    $users = Get-content /etc/passwd
    $userarray = New-Object System.Collections.ArrayList
    foreach ($user in $users)
    {
        $splitted = $user.split(":")
        $object = [PSCustomObject]@{
            "Name" = $splitted[0]
            "Pass" = $splitted[1]
            "ID_User" = $splitted[2]
            "ID_Group" = $splitted[3]
            "Comment" = $splitted[4]
            "Home" = $splitted[5]
            "Shell" = $splitted[6]
        }
        $userarray.Add($object) | Out-Null    

    }
    if($totallist)
    {
        $return = $userarray | Where-Object {$_.name -in $totallist.split(",")}
        return $return
    }
    if ($filter)
    {
        $filter -match '(?&ltpropertyname&gt(Name|Pass|ID_User|ID_Group|Comment|Home|Shell))\s+(?&ltoperator&gt(-like|-eq|-ceq|-clike))\s+"(?&ltvalue&gt.*)"' | Out-Null
        
        
        Switch ($matches.operator)
        {
            "-like" {$return = $userarray | Where-Object {$_.$($matches.propertyname) -like "$($matches.value)"}}
            "-clike"{$return = $userarray | Where-Object {$_.$($matches.propertyname) -clike "$($matches.value)"}}
            "-eq"   {$return = $userarray | Where-Object {$_.$($matches.propertyname) -eq "$($matches.value)"}}
            "-ceq"  {$return = $userarray | Where-Object {$_.$($matches.propertyname) -ceq "$($matches.value)"}}
        }
        return ($return)

    }
    elseif ($name) {
        $return = $userarray | Where-Object {$_.name -eq $name}
        return ($return)
    }
    else {
        return $userarray    
    }
    
}