Differences between version 3 and previous revision of TarNotes.
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| Newer page: | version 3 | Last edited on Tuesday, October 14, 2003 12:26:06 pm | by AristotlePagaltzis | Revert |
| Older page: | version 2 | Last edited on Tuesday, October 14, 2003 10:56:50 am | by MichaelBordignon | Revert |
@@ -1,29 +1,22 @@
-!!Multiple Tar Files
+!!! Multivolume [TarBall]s
-Sometimes it is necessary to split a tar archive over
several volumes, or
files.
+Sometimes it is necessary to split a TarBall into
several files, ie volumes
. The simplest approach is to use split(1):
-If you specify several
archive files,
tar will use them in the order given
. Try something like this:
+ tar cvzf - dirs/ | split --bytes 1m -
archive.
tar.gz.part-
-
tar -c
-L 50000
-f archive1 -f archive2 -f archive3 ... path
+Should you need to, you can achieve this goal without split(1) using
tar(1)'s __
-L__ switch, which sets a volume size limit. While the poorly organized info page for tar(1) mentions this, the man page contains no hint that you must also specify a list of filenames for tar(1) to use by passing more than one __
-f__ switch:
-Be sure to specify enough archive files to hold the entire data
.
+ tar c -L 50000 -f archive1 -f archive2 -f archive3 [[
... ] path/
-You won
't find this use of multiple -f options mentioned in
the
-man page
, but it is in the info page. (You have to hunt around
-to find it, though--the GNU tar info page is poorly organized.)
-
-Here is my crackin bash
script to backup stuff into 1gig volumes
:
+Make sure to specify enough archive files to hold the entire data. If you don
't want to be bothered with math
the computer can do for you
, this
script should help
:
#!/bin/bash
+ VOL_SIZE_KB=1000000
+ BASENAME=archive
- cd /test/archive/
- each_archivesize
=1000000
- totalkbytes=`
du -s . | cut -d "."
-f 1`
- num
_volumes
=`expr
$totalkbytes
/ $each
_archivesize
+ 1`
- tar_args=`for i in $(seq 1 $num_volumes
) ; do echo -n "-f archive$i.tar "; done`
-
- tar -cvL $each_archivesize $tar_args --totals *
+ TOTAL
=$(
du -s . | cut -d $'\t'
-f 1 )
+ NUM
_VOLUMES
=$(( $TOTAL
/ $VOL
_SIZE_KB
+ 1 ))
-Another approach is to use split, ie
+ tar cv -L $VOL_SIZE $( seq -f "-f $BASENAME-%03g.tar" 1 $NUM_VOLUMES_KB ) --totals *
-$ tar cvzf
- dirs | split --bytes=1m - archive
.tar.gz.part-
+The example will create 1GB [TarBall]s of the current directory named __archive
-*__
.
