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To get information about the contents of an archived directory, use the directory name as a file name argument in conjunction with --list (-t). To find out file attributes, include the --verbose (-v) option.
For example, to find out about files in the directory practice, in the archive file music.tar, type:
$ tar --list --verbose --file=music.tar practice
tar responds:
drwxrwxrwx myself user 0 1990-05-31 21:49 practice/ -rw-r--r-- myself user 42 1990-05-21 13:29 practice/blues -rw-r--r-- myself user 62 1990-05-23 10:55 practice/folk -rw-r--r-- myself user 40 1990-05-21 13:30 practice/jazz -rw-r--r-- myself user 10240 1990-05-31 21:49 practice/collection.tar
When you use a directory name as a file name argument, tar acts on all the files (including sub-directories) in that directory.