mkdir 'MyDir', 0777 or die "Oops, couldn't make dir: $!"; open FILE1, '>MyDir/test1.file' or die "Couldn't open file: $!"; print FILE1 'This goes in test1.file'; close FILE1; chdir 'MyDir'; rename 'test1.file', 'MyName.txt'; unlink 'MyName.txt';