diff options
Diffstat (limited to 'doc/tar.texi')
| -rw-r--r-- | doc/tar.texi | 61 |
1 files changed, 49 insertions, 12 deletions
diff --git a/doc/tar.texi b/doc/tar.texi index 30fa61fc..52b774cb 100644 --- a/doc/tar.texi +++ b/doc/tar.texi @@ -3153,10 +3153,13 @@ Specifies that @command{tar} should reblock its input, for reading from pipes on systems with buggy implementations. @xref{Reading}. @opsummary{record-size} -@item --record-size=@var{size} +@item --record-size=@var{size}[@var{suf}] Instructs @command{tar} to use @var{size} bytes per record when accessing the -archive. @xref{Blocking Factor}. +archive. The argument can be suffixed with a @dfn{size suffix}, e.g. +@option{--record-size=10K} for 10 Kilobytes. @xref{size-suffixes}, +for a list of valid suffixes. @xref{Blocking Factor}, for a detailed +description of this option. @opsummary{recursion} @item --recursion @@ -3306,11 +3309,15 @@ Alters the suffix @command{tar} uses when backing up files from the default @samp{~}. @xref{backup}. @opsummary{tape-length} -@item --tape-length=@var{num} -@itemx -L @var{num} +@item --tape-length=@var{num}[@var{suf}] +@itemx -L @var{num}[@var{suf}] Specifies the length of tapes that @command{tar} is writing as being -@w{@var{num} x 1024} bytes long. @xref{Using Multiple Tapes}. +@w{@var{num} x 1024} bytes long. If optional @var{suf} is given, it +specifies a multiplicative factor to be used instead of 1024. For +example, @samp{-L2M} means 2 megabytes. @xref{size-suffixes}, for a +list of allowed suffixes. @xref{Using Multiple Tapes}, for a detailed +discussion of this option. @opsummary{test-label} @item --test-label @@ -10345,8 +10352,27 @@ that may be larger than will fit on the medium used to hold it. @xopindex{tape-length, short description} @item -L @var{num} -@itemx --tape-length=@var{num} -Change tape after writing @var{num} x 1024 bytes. +@itemx --tape-length=@var{size}[@var{suf}] +Change tape after writing @var{size} units of data. Unless @var{suf} is +given, @var{size} is treated as kilobytes, i.e. @samp{@var{size} x +1024} bytes. The following suffixes alter this behavior: + +@float Table, size-suffixes +@caption{Size Suffixes} +@multitable @columnfractions 0.2 0.3 0.3 +@headitem Suffix @tab Units @tab Byte Equivalent +@item b @tab Blocks @tab @var{size} x 512 +@item B @tab Kilobytes @tab @var{size} x 1024 +@item c @tab Bytes @tab @var{size} +@item G @tab Gigabytes @tab @var{size} x 1024^3 +@item K @tab Kilobytes @tab @var{size} x 1024 +@item k @tab Kilobytes @tab @var{size} x 1024 +@item M @tab Megabytes @tab @var{size} x 1024^2 +@item P @tab Petabytes @tab @var{size} x 1024^5 +@item T @tab Terabytes @tab @var{size} x 1024^4 +@item w @tab Words @tab @var{size} x 2 +@end multitable +@end float This option might be useful when your tape drivers do not properly detect end of physical tapes. By being slightly conservative on the @@ -11154,15 +11180,26 @@ tape: @anchor{tape-length} @table @option @opindex tape-length -@item --tape-length=@var{size} -@itemx -L @var{size} -Set maximum length of a volume. The @var{size} argument should then -be the usable size of the tape in units of 1024 bytes. This option -selects @option{--multi-volume} automatically. For example: +@item --tape-length=@var{size}[@var{suf}] +@itemx -L @var{size}[@var{suf}] +Set maximum length of a volume. The @var{suf}, if given, specifies +units in which @var{size} is expressed, e.g. @samp{2M} mean 2 +megabytes (@pxref{size-suffixes}, for a list of allowed size +suffixes). Without @var{suf}, units of 1024 bytes (kilobyte) are +assumed. + +This option selects @option{--multi-volume} automatically. For example: @smallexample $ @kbd{tar --create --tape-length=41943040 --file=/dev/tape @var{files}} @end smallexample + +@noindent +or, which is equivalent: + +@smallexample +$ @kbd{tar --create --tape-length=4G --file=/dev/tape @var{files}} +@end smallexample @end table @anchor{change volume prompt} |