Extract the named files from the tape. If no file argument is given, the entire content of the tape is extracted. Note that if multiple entries specifying the same file are on the tape, the last entry overwrites all earlier entries. X For each file to be extracted, if it is identical to the file in the corresponding position in the comparison tree, link the existing file to the new file. Otherwise, extract the new file as a separate new file.
X is like x but also takes the next argument as the root of a directory tree for comparison.
If no file argument is given, list all of the names on the tape. This option assumes that you are at the beginning of the tape. C Compare files on tape against existing files. For each specified file, print a line with a key character followed by the file name. On output, tar normally places information specifying owner and modes of directories in the archive.