(options): Improved sorting. Document --backup=off.

(decode_options): Clear backup_option if necessary.

src/tar.c

@@ -252,6 +252,7 @@ Examples:\n\
   tar -xf archive.tar          # Extract all files from archive.tar.\n\
 \vThe backup suffix is `~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
 The version control may be set with --backup or VERSION_CONTROL, values are:\n\n\
+  none, off       never make backups\n\
   t, numbered     make numbered backups\n\
   nil, existing   numbered if numbered backups exist, simple otherwise\n\
   never, simple   always make simple backups\n");
@@ -298,32 +299,8 @@ static struct argp_option options[] = {
   {NULL, 0, NULL, 0,
    N_("Operation modifiers:"), 20},
 
-  {"verify", 'W', 0, 0,
-   N_("attempt to verify the archive after writing it"), 21 },
-  {"remove-files", REMOVE_FILES_OPTION, 0, 0,
-   N_("remove files after adding them to the archive"), 21 },
-  {"keep-old-files", 'k', 0, 0,
-   N_("don't replace existing files when extracting"), 21 },
-  {"keep-newer-files", KEEP_NEWER_FILES_OPTION, 0, 0,
-   N_("don't replace existing files that are newer than their archive copies"), 21 },
-  {"no-overwrite-dir", NO_OVERWRITE_DIR_OPTION, 0, 0,
-   N_("preserve metadata of existing directories"), 21 },
-  {"overwrite", OVERWRITE_OPTION, 0, 0,
-   N_("overwrite existing files when extracting"), 21 },
-  {"unlink-first", 'U', 0, 0,
-   N_("remove each file prior to extracting over it"), 21 },
-  {"recursive-unlink", RECURSIVE_UNLINK_OPTION, 0, 0,
-   N_("empty hierarchies prior to extracting directory"), 21 },
   {"sparse", 'S', 0, 0,
    N_("handle sparse files efficiently"), 21 },
-  {"to-stdout", 'O', 0, 0,
-   N_("extract files to standard output"), 21 },
-  {"to-command", TO_COMMAND_OPTION, N_("COMMAND"), 0,
-   N_("pipe extracted files to another program"), 21 },
-  {"ignore-command-error", IGNORE_COMMAND_ERROR_OPTION, 0, 0,
-   N_("ignore exit codes of children"), 21 },
-  {"no-ignore-command-error", NO_IGNORE_COMMAND_ERROR_OPTION, 0, 0,
-   N_("treat non-zero exit codes of children as error"), 21 },
   {"incremental", 'G', 0, 0,
    N_("handle old GNU-format incremental backup"), 21 },
   {"listed-incremental", 'g', N_("FILE"), 0,
@@ -334,221 +311,254 @@ static struct argp_option options[] = {
    N_("process only the NUMBERth occurrence of each file in the archive. This option is valid only in conjunction with one of the subcommands --delete, --diff, --extract or --list and when a list of files is given either on the command line or via -T option. NUMBER defaults to 1."), 21 },
   {"seek", 'n', NULL, 0,
    N_("Archive is seekable"), 21 },
+
+  {NULL, 0, NULL, 0,
+   N_("Overwrite control:"), 30},
+
+  {"verify", 'W', 0, 0,
+   N_("attempt to verify the archive after writing it"), 31 },
+  {"remove-files", REMOVE_FILES_OPTION, 0, 0,
+   N_("remove files after adding them to the archive"), 31 },
+  {"keep-old-files", 'k', 0, 0,
+   N_("don't replace existing files when extracting"), 31 },
+  {"keep-newer-files", KEEP_NEWER_FILES_OPTION, 0, 0,
+   N_("don't replace existing files that are newer than their archive copies"), 31 },
+  {"overwrite", OVERWRITE_OPTION, 0, 0,
+   N_("overwrite existing files when extracting"), 31 },
+  {"unlink-first", 'U', 0, 0,
+   N_("remove each file prior to extracting over it"), 31 },
+  {"recursive-unlink", RECURSIVE_UNLINK_OPTION, 0, 0,
+   N_("empty hierarchies prior to extracting directory"), 31 },
+  {"no-overwrite-dir", NO_OVERWRITE_DIR_OPTION, 0, 0,
+   N_("preserve metadata of existing directories"), 31 },
+
+  {NULL, 0, NULL, 0,
+   N_("Select output stream:"), 40},
+
+  {"to-stdout", 'O', 0, 0,
+   N_("extract files to standard output"), 41 },
+  {"to-command", TO_COMMAND_OPTION, N_("COMMAND"), 0,
+   N_("pipe extracted files to another program"), 41 },
+  {"ignore-command-error", IGNORE_COMMAND_ERROR_OPTION, 0, 0,
+   N_("ignore exit codes of children"), 41 },
+  {"no-ignore-command-error", NO_IGNORE_COMMAND_ERROR_OPTION, 0, 0,
+   N_("treat non-zero exit codes of children as error"), 41 },
     
   {NULL, 0, NULL, 0,
-   N_("Handling of file attributes:"), 30 },
+   N_("Handling of file attributes:"), 50 },
 
   {"owner", OWNER_OPTION, N_("NAME"), 0,
-   N_("force NAME as owner for added files"), 31 },
+   N_("force NAME as owner for added files"), 51 },
   {"group", GROUP_OPTION, N_("NAME"), 0,
-   N_("force NAME as group for added files"), 31 },
+   N_("force NAME as group for added files"), 51 },
   {"mode", MODE_OPTION, N_("CHANGES"), 0,
-   N_("force (symbolic) mode CHANGES for added files"), 31 },
+   N_("force (symbolic) mode CHANGES for added files"), 51 },
   {"atime-preserve", ATIME_PRESERVE_OPTION, 0, 0,
-   N_("don't change access times on dumped files"), 31 },
+   N_("don't change access times on dumped files"), 51 },
   {"touch", 'm', 0, 0,
-   N_("don't extract file modified time"), 31 },
+   N_("don't extract file modified time"), 51 },
   {"same-owner", SAME_OWNER_OPTION, 0, 0,
-   N_("try extracting files with the same ownership"), 31 },
+   N_("try extracting files with the same ownership"), 51 },
   {"no-same-owner", NO_SAME_OWNER_OPTION, 0, 0,
-   N_("extract files as yourself"), 31 },
+   N_("extract files as yourself"), 51 },
   {"numeric-owner", NUMERIC_OWNER_OPTION, 0, 0,
-   N_("always use numbers for user/group names"), 31 },
+   N_("always use numbers for user/group names"), 51 },
   {"preserve-permissions", 'p', 0, 0,
-   N_("extract information about file permissions (default for superuser)"), 31 },
-  {"same-permissions", 0, 0, OPTION_ALIAS, NULL, 31 },
+   N_("extract information about file permissions (default for superuser)"),
+   51 },
+  {"same-permissions", 0, 0, OPTION_ALIAS, NULL, 51 },
   {"no-same-permissions", NO_SAME_PERMISSIONS_OPTION, 0, 0,
-   N_("apply the user's umask when extracting permissions from the archive (default for ordinary users)"), 31 },
+   N_("apply the user's umask when extracting permissions from the archive (default for ordinary users)"), 51 },
   {"preserve-order", 's', 0, 0,
-   N_("sort names to extract to match archive"), 31 },
-  {"same-order", 0, 0, OPTION_ALIAS, NULL, 31 },
+   N_("sort names to extract to match archive"), 51 },
+  {"same-order", 0, 0, OPTION_ALIAS, NULL, 51 },
   {"preserve", PRESERVE_OPTION, 0, 0,
-   N_("same as both -p and -s"), 31 },
+   N_("same as both -p and -s"), 51 },
 
   {NULL, 0, NULL, 0,
-   N_("Device selection and switching:"), 40 },
+   N_("Device selection and switching:"), 60 },
   
   {"file", 'f', N_("ARCHIVE"), 0,
-   N_("use archive file or device ARCHIVE"), 41 },
+   N_("use archive file or device ARCHIVE"), 61 },
   {"force-local", FORCE_LOCAL_OPTION, 0, 0,
-   N_("archive file is local even if has a colon"), 41 },
+   N_("archive file is local even if has a colon"), 61 },
   {"rmt-command", RMT_COMMAND_OPTION, N_("COMMAND"), 0,
-   N_("use given rmt COMMAND instead of rmt"), 41 }, 
+   N_("use given rmt COMMAND instead of rmt"), 61 }, 
   {"rsh-command", RSH_COMMAND_OPTION, N_("COMMAND"), 0,
-   N_("use remote COMMAND instead of rsh"), 41 },
+   N_("use remote COMMAND instead of rsh"), 61 },
 #ifdef DEVICE_PREFIX
   {"-[0-7][lmh]", 0, NULL, OPTION_DOC, /* It is OK, since `name' will never be
 					  translated */
-   N_("specify drive and density"), 41 },
+   N_("specify drive and density"), 61 },
 #endif  
-  {NULL, '0', NULL, OPTION_HIDDEN, NULL, 41 },
-  {NULL, '1', NULL, OPTION_HIDDEN, NULL, 41 },
-  {NULL, '2', NULL, OPTION_HIDDEN, NULL, 41 },
-  {NULL, '3', NULL, OPTION_HIDDEN, NULL, 41 },
-  {NULL, '4', NULL, OPTION_HIDDEN, NULL, 41 },
-  {NULL, '5', NULL, OPTION_HIDDEN, NULL, 41 },
-  {NULL, '6', NULL, OPTION_HIDDEN, NULL, 41 },
-  {NULL, '7', NULL, OPTION_HIDDEN, NULL, 41 },
-  {NULL, '8', NULL, OPTION_HIDDEN, NULL, 41 },
-  {NULL, '9', NULL, OPTION_HIDDEN, NULL, 41 },
+  {NULL, '0', NULL, OPTION_HIDDEN, NULL, 61 },
+  {NULL, '1', NULL, OPTION_HIDDEN, NULL, 61 },
+  {NULL, '2', NULL, OPTION_HIDDEN, NULL, 61 },
+  {NULL, '3', NULL, OPTION_HIDDEN, NULL, 61 },
+  {NULL, '4', NULL, OPTION_HIDDEN, NULL, 61 },
+  {NULL, '5', NULL, OPTION_HIDDEN, NULL, 61 },
+  {NULL, '6', NULL, OPTION_HIDDEN, NULL, 61 },
+  {NULL, '7', NULL, OPTION_HIDDEN, NULL, 61 },
+  {NULL, '8', NULL, OPTION_HIDDEN, NULL, 61 },
+  {NULL, '9', NULL, OPTION_HIDDEN, NULL, 61 },
   
   {"multi-volume", 'M', 0, 0,
-   N_("create/list/extract multi-volume archive"), 41 },
+   N_("create/list/extract multi-volume archive"), 61 },
   {"tape-length", 'L', N_("NUMBER"), 0,
-   N_("change tape after writing NUMBER x 1024 bytes"), 41 },
+   N_("change tape after writing NUMBER x 1024 bytes"), 61 },
   {"info-script", 'F', N_("NAME"), 0,
-   N_("run script at end of each tape (implies -M)"), 41 },
-  {"new-volume-script", 0, 0, OPTION_ALIAS, NULL, 41 },
+   N_("run script at end of each tape (implies -M)"), 61 },
+  {"new-volume-script", 0, 0, OPTION_ALIAS, NULL, 61 },
   {"volno-file", VOLNO_FILE_OPTION, N_("FILE"), 0,
-   N_("use/update the volume number in FILE"), 41 },
+   N_("use/update the volume number in FILE"), 61 },
 
   {NULL, 0, NULL, 0,
-   N_("Device blocking:"), 50 },
+   N_("Device blocking:"), 70 },
 
   {"blocking-factor", 'b', N_("BLOCKS"), 0,
-   N_("BLOCKS x 512 bytes per record"), 51 },
+   N_("BLOCKS x 512 bytes per record"), 71 },
   {"record-size", RECORD_SIZE_OPTION, N_("NUMBER"), 0,
-   N_("SIZE bytes per record, multiple of 512"), 51 },
+   N_("SIZE bytes per record, multiple of 512"), 71 },
   {"ignore-zeros", 'i', 0, 0,
-   N_("ignore zeroed blocks in archive (means EOF)"), 51 },
+   N_("ignore zeroed blocks in archive (means EOF)"), 71 },
   {"read-full-records", 'B', 0, 0,
-   N_("reblock as we read (for 4.2BSD pipes)"), 51 }, 
+   N_("reblock as we read (for 4.2BSD pipes)"), 71 }, 
 
   {NULL, 0, NULL, 0,
-   N_("Archive format selection:"), 60 },
+   N_("Archive format selection:"), 80 },
   
   {"format", 'H', N_("FORMAT"), 0,
-   N_("create archive of the given format."), 61 },
+   N_("create archive of the given format."), 81 },
 
-  {NULL, 0, NULL, 0, N_("FORMAT is one of the following:"), 62 },
-  {"  v7", 0, NULL, OPTION_DOC|OPTION_NO_TRANS, N_("old V7 tar format"), 63},
+  {NULL, 0, NULL, 0, N_("FORMAT is one of the following:"), 82 },
+  {"  v7", 0, NULL, OPTION_DOC|OPTION_NO_TRANS, N_("old V7 tar format"), 83},
   {"  oldgnu", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
-   N_("GNU format as per tar <= 1.12"), 63},
+   N_("GNU format as per tar <= 1.12"), 83},
   {"  gnu", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
-   N_("GNU tar 1.13.x format"), 63},
+   N_("GNU tar 1.13.x format"), 83},
   {"  ustar", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
-   N_("POSIX 1003.1-1988 (ustar) format"), 63 },
+   N_("POSIX 1003.1-1988 (ustar) format"), 83 },
   {"  pax", 0, NULL, OPTION_DOC|OPTION_NO_TRANS,
-   N_("POSIX 1003.1-2001 (pax) format"), 63 },
-  {"  posix", 0, NULL, OPTION_DOC|OPTION_NO_TRANS, N_("Same as pax"), 63 },
+   N_("POSIX 1003.1-2001 (pax) format"), 83 },
+  {"  posix", 0, NULL, OPTION_DOC|OPTION_NO_TRANS, N_("Same as pax"), 83 },
   
   {"old-archive", OLD_ARCHIVE_OPTION, 0, 0, /* FIXME */
-   N_("same as --format=v7"), 68 },
-  {"portability", 0, 0, OPTION_ALIAS, NULL, 68 },
+   N_("same as --format=v7"), 88 },
+  {"portability", 0, 0, OPTION_ALIAS, NULL, 88 },
   {"posix", POSIX_OPTION, 0, 0,
-   N_("same as --format=posix"), 68 },
+   N_("same as --format=posix"), 88 },
   {"pax-option", PAX_OPTION, N_("keyword[[:]=value][,keyword[[:]=value], ...]"), 0,
-   N_("control pax keywords"), 68 },
+   N_("control pax keywords"), 88 },
   {"label", 'V', N_("TEXT"), 0,
-   N_("create archive with volume name NAME. At list/extract time, use TEXT as a globbing pattern"), 68 },
+   N_("create archive with volume name NAME. At list/extract time, use TEXT as a globbing pattern"), 88 },
   {"bzip2", 'j', 0, 0,
-   N_("filter the archive through bzip2"), 68 },
+   N_("filter the archive through bzip2"), 88 },
   {"gzip", 'z', 0, 0,
-   N_("filter the archive through gzip"), 68 },
-  {"gunzip", 0, 0, OPTION_ALIAS, NULL, 68 },
-  {"ungzip", 0, 0, OPTION_ALIAS, NULL, 68 },
+   N_("filter the archive through gzip"), 88 },
+  {"gunzip", 0, 0, OPTION_ALIAS, NULL, 88 },
+  {"ungzip", 0, 0, OPTION_ALIAS, NULL, 88 },
   {"compress", 'Z', 0, 0,
-   N_("filter the archive through compress"), 68 },
-  {"uncompress", 0, 0, OPTION_ALIAS, NULL, 68 },
+   N_("filter the archive through compress"), 88 },
+  {"uncompress", 0, 0, OPTION_ALIAS, NULL, 88 },
   {"use-compress-program", USE_COMPRESS_PROGRAM_OPTION, N_("PROG"), 0,
-   N_("filter through PROG (must accept -d)"), 68 },
+   N_("filter through PROG (must accept -d)"), 88 },
 
   {NULL, 0, NULL, 0,
-   N_("Local file selection:"), 70 },
+   N_("Local file selection:"), 90 },
 
   {"add-file", ARGP_KEY_ARG, N_("FILE"), 0,
-   N_("add given file to the archive (useful if FILE name starts with a dash)"), 71},
+   N_("add given file to the archive (useful if FILE name starts with a dash)"), 91},
   {"directory", 'C', N_("DIR"), 0,
-   N_("change to directory DIR"), 71 },
+   N_("change to directory DIR"), 91 },
   {"files-from", 'T', N_("FILE-OF-NAMES"), 0,
-   N_("get names to extract or create from file NAME"), 71 },
+   N_("get names to extract or create from file NAME"), 91 },
   {"null", NULL_OPTION, 0, 0,
-   N_("-T reads null-terminated names, disable -C"), 71 },
+   N_("-T reads null-terminated names, disable -C"), 91 },
   {"unquote", UNQUOTE_OPTION, 0, 0,
-   N_("Unquote filenames read with -T (default)"), 71 },
+   N_("Unquote filenames read with -T (default)"), 91 },
   {"no-unquote", NO_UNQUOTE_OPTION, 0, 0,
-   N_("Do not unquote filenames read with -T"), 71 },
+   N_("Do not unquote filenames read with -T"), 91 },
   {"exclude", EXCLUDE_OPTION, N_("PATTERN"), 0,
-   N_("exclude files, given as a PATTERN"), 71 },
+   N_("exclude files, given as a PATTERN"), 91 },
   {"exclude-from", 'X', N_("FILE"), 0,
-   N_("exclude patterns listed in FILE"), 71 },
+   N_("exclude patterns listed in FILE"), 91 },
   {"exclude-caches", EXCLUDE_CACHES_OPTION, 0, 0,
-   N_("exclude directories containing a cache tag"), 71 },
+   N_("exclude directories containing a cache tag"), 91 },
   {"ignore-case", IGNORE_CASE_OPTION, 0, 0,
-   N_("exclusion ignores case"), 71 },
+   N_("exclusion ignores case"), 91 },
   {"anchored", ANCHORED_OPTION, 0, 0,
-   N_("exclude patterns match file name start"), 71 },
+   N_("exclude patterns match file name start"), 91 },
   {"no-anchored", NO_ANCHORED_OPTION, 0, 0,
-   N_("exclude patterns match after any / (default)"), 71 },
+   N_("exclude patterns match after any / (default)"), 91 },
   {"no-ignore-case", NO_IGNORE_CASE_OPTION, 0, 0,
-   N_("exclusion is case sensitive (default)"), 71 },
+   N_("exclusion is case sensitive (default)"), 91 },
   {"no-wildcards", NO_WILDCARDS_OPTION, 0, 0,
-   N_("exclude patterns are plain strings"), 71 },
+   N_("exclude patterns are plain strings"), 91 },
   {"no-wildcards-match-slash", NO_WILDCARDS_MATCH_SLASH_OPTION, 0, 0,
-   N_("exclude pattern wildcards do not match '/'"), 71 },
+   N_("exclude pattern wildcards do not match '/'"), 91 },
   {"no-recursion", NO_RECURSION_OPTION, 0, 0,
-   N_("avoid descending automatically in directories"), 71 },
+   N_("avoid descending automatically in directories"), 91 },
   {"one-file-system", ONE_FILE_SYSTEM_OPTION, 0, 0,
-   N_("stay in local file system when creating archive"), 71 },
-  {NULL, 'l', 0, OPTION_HIDDEN, "", 71},
+   N_("stay in local file system when creating archive"), 91 },
+  {NULL, 'l', 0, OPTION_HIDDEN, "", 91},
   {"recursion", RECURSION_OPTION, 0, 0,
-   N_("recurse into directories (default)"), 71 },
+   N_("recurse into directories (default)"), 91 },
   {"absolute-names", 'P', 0, 0,
-   N_("don't strip leading `/'s from file names"), 71 },
+   N_("don't strip leading `/'s from file names"), 91 },
   {"dereference", 'h', 0, 0,
-   N_("dump instead the files symlinks point to"), 71 },
+   N_("dump instead the files symlinks point to"), 91 },
   {"starting-file", 'K', N_("MEMBER-NAME"), 0,
-   N_("begin at member MEMBER-NAME in the archive"), 71 },
+   N_("begin at member MEMBER-NAME in the archive"), 91 },
   {"strip-components", STRIP_COMPONENTS_OPTION, N_("NUMBER"), 0,
-   N_("strip NUMBER leading components from file names"), 71 },
+   N_("strip NUMBER leading components from file names"), 91 },
   {"newer", 'N', N_("DATE-OR-FILE"), 0,
-   N_("only store files newer than DATE-OR-FILE"), 71 },
+   N_("only store files newer than DATE-OR-FILE"), 91 },
   {"newer-mtime", NEWER_MTIME_OPTION, N_("DATE"), 0,
-   N_("compare date and time when data changed only"), 71 },
+   N_("compare date and time when data changed only"), 91 },
   {"after-date", 'N', N_("DATE"), 0,
-   N_("same as -N"), 71 },
+   N_("same as -N"), 91 },
   {"backup", BACKUP_OPTION, N_("CONTROL"), OPTION_ARG_OPTIONAL,
-   N_("backup before removal, choose version CONTROL"), 71 },
+   N_("backup before removal, choose version CONTROL"), 91 },
   {"suffix", SUFFIX_OPTION, N_("STRING"), 0,
-   N_("backup before removal, override usual suffix ('~' unless overridden by environment variable SIMPLE_BACKUP_SUFFIX"), 71 },
+   N_("backup before removal, override usual suffix ('~' unless overridden by environment variable SIMPLE_BACKUP_SUFFIX"), 91 },
   {"wildcards", WILDCARDS_OPTION, 0, 0,
-   N_("exclude patterns use wildcards (default)"), 71 },
+   N_("exclude patterns use wildcards (default)"), 91 },
   {"wildcards-match-slash", WILDCARDS_MATCH_SLASH_OPTION, 0, 0,
-   N_("exclude pattern wildcards match '/' (default)"), 71 },
+   N_("exclude pattern wildcards match '/' (default)"), 91 },
 
   {NULL, 0, NULL, 0,
-   N_("Informative output:"), 80 },
+   N_("Informative output:"), 100 },
   
   {"verbose", 'v', 0, 0,
-   N_("verbosely list files processed"), 81 },
+   N_("verbosely list files processed"), 101 },
   {"checkpoint", CHECKPOINT_OPTION, 0, 0,
-   N_("display progress messages every 10th record"), 81 },
+   N_("display progress messages every 10th record"), 101 },
   {"check-links", CHECK_LINKS_OPTION, 0, 0,
-   N_("print a message if not all links are dumped"), 82 },
+   N_("print a message if not all links are dumped"), 102 },
   {"totals", TOTALS_OPTION, 0, 0,
-   N_("print total bytes written while creating archive"), 82 },
+   N_("print total bytes written while creating archive"), 102 },
   {"utc", UTC_OPTION, 0, 0,
-   N_("print file modification dates in UTC"), 82 },
+   N_("print file modification dates in UTC"), 102 },
   {"index-file", INDEX_FILE_OPTION, N_("FILE"), 0,
-   N_("send verbose output to FILE"), 82 },
+   N_("send verbose output to FILE"), 102 },
   {"block-number", 'R', 0, 0,
-   N_("show block number within archive with each message"), 82 },
+   N_("show block number within archive with each message"), 102 },
   {"interactive", 'w', 0, 0,
-   N_("ask for confirmation for every action"), 82 },
-  {"confirmation", 0, 0, OPTION_ALIAS, NULL, 82 },
+   N_("ask for confirmation for every action"), 102 },
+  {"confirmation", 0, 0, OPTION_ALIAS, NULL, 102 },
   {"show-defaults", SHOW_DEFAULTS_OPTION, 0, 0,
-   N_("Show tar defaults"), 82 },
+   N_("Show tar defaults"), 102 },
   {"show-omitted-dirs", SHOW_OMITTED_DIRS_OPTION, 0, 0,
-   N_("When listing or extracting, list each directory that does not match search criteria"), 82 },
+   N_("When listing or extracting, list each directory that does not match search criteria"), 102 },
   
   {NULL, 0, NULL, 0,
-   N_("Compatibility options:"), 90 },
+   N_("Compatibility options:"), 110 },
 
   {NULL, 'o', 0, 0,
-   N_("when creating, same as --old-archive. When extracting, same as --no-same-owner"), 91 },
+   N_("when creating, same as --old-archive. When extracting, same as --no-same-owner"), 111 },
 
   {NULL, 0, NULL, 0,
-   N_("Other options:"), 100 },
+   N_("Other options:"), 120 },
 
   {"help",  '?', 0, 0,  N_("Give this help list"), -1},
   {"usage", USAGE_OPTION, 0, 0,  N_("Give a short usage message"), -1},
@@ -1762,7 +1772,13 @@ decode_options (int argc, char **argv)
     simple_backup_suffix = xstrdup (args.backup_suffix_string);
 
   if (backup_option)
-    backup_type = xget_version ("--backup", args.version_control_string);
+    {
+      backup_type = xget_version ("--backup", args.version_control_string);
+      /* No backup is needed either if explicitely disabled or if
+	 the extracted files are not being written to disk. */
+      if (backup_type == no_backups || EXTRACT_OVER_PIPE)
+	backup_option = false;
+    }
 
   if (verbose_option && args.textual_date_option)
     {