PowerShell grep -f

<#
.SYNOPSIS
Grep-like search command

.DESCRIPTION
This script works like 'grep -f FILE'.

.PARAMETER Directory
target directory (default '.')

.PARAMETER Keyword
path name to keyword file (default 'keyword.txt')
#>

Param (
    [parameter(Mandatory=$false)][String]$Directory='.'
    , [parameter(Mandatory=$false)][String]$Keyword='keyword.txt'
)

$Keywords = Get-Content $Keyword
Get-ChildItem $Directory -Filter '*.csv' | ForEach-Object {
    $File = $_.Name
    Write-Output $File
    $Keywords | ForEach-Object {
        $Count = (Select-String -Pattern $_ -Path $File | Measure-Object).Count
        if ($Count -gt 0) {
            Write-Output ${_}:$Count
        }
    }