> Get-Content C:\var\log\nlog-own-2017-11-27.log -wait -tail 10 -Encoding UTF8
> Set-ItemProperty .\test.txt -Name CreationTime -Value "2018/06/12 15:30:00"
> Set-ItemProperty .\test.txt -Name LastWriteTime -Value "2018/06/12 15:30:00"
Get-Content [ファイル] | select-string [検索文字列]
(Get-Content [ファイル] | Measure-Object).Count