powershell_tricks.txt

# Trim ending characters of a filename of every file in a folder
Get-ChildItem 'FOLDER_NAME' | rename-item -newname { $_.name.substring(0, $_.name.length-N) }

# Trim beginning N characters of a filename of every file in a folder
get-childitem *.txt | rename-item -newname { [string]($_.name).substring(N) }

# Append a file extension to every file in a folder
Get-ChildItem 'FOLDER_NAME' | rename-item -NewName {$_.FullName + ".pdf"} 

# Append text to every filename BEFORE the file extension
Get-ChildItem 'FOLDER_NAME' | % { rename-item –path $_.Fullname –Newname ( $_.basename + (get-date -format 'TEXT_TO_APPEND') + $_.extension) }