システム日付のファイルなどを作成する時に、
test.ps1
$today = Get-Date -Format yyyyMMdd
"$today.txt"
だと一度変数に展開しないといけないので
test.ps1
"$(Get-Date -Format yyyyMMdd).txt"
これだとわざわざ変数に展開せずに済む。
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