1 1 Unlink First 1 ............ 1 1 '--unlink-first' 1 '-U' 1 Remove files before extracting over them. This can make 'tar' run 1 a bit faster if you know in advance that the extracted files all 1 need to be removed. Normally this option slows 'tar' down 1 slightly, so it is disabled by default. 1