PowerShell Grep Equivilent

gistfile1.ps1

function Select-StringSpecial {
	param(
		[string] $query
	)
	Begin {
		# Executes once before first item in pipeline is processed
	}
	Process {
		# Executes once for each pipeline object
		$args = @{}
		$tempArg = ""
		foreach($param in $query.split(" "))
		{
			if("" -ne $tempArg)
			{
				if(-1 -ne $param.IndexOf(","))
				{
					$param = $param.Split(",")
				}
				$args.Add($tempArg, $param)
				$tempArg = ""
				continue
			}
			if(-1 -eq $param.IndexOf("-"))
			{
				$args.Add("pattern",$param)
			}
			else
			{
				$tempArg = $param
			}
		}
		($_ | Out-String).split("`n") | Select-String @args
	}
	End {
		# Executes once after last pipeline object is processed
	}	
}
Set-Alias ss Select-StringSpecial
Set-Alias grep Select-StringSpecial

As a fast alternative for linux/unix grep (for files) you could also try the psitems powershell module. It includes a psgrep command (alias for Find-ItemContent) that works similar to the linux/unix grep command (the basic way, only a few parameters of original grep included).

Install-Module -Name PSItems
Import-Module -Name PSItems
psgrep 'test' -H -R 

(above command searches for pattern test in all files in current directory recursively (-R) and highlights the results (-H))

Fore more information check the README.