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Top Forums UNIX for Dummies Questions & Answers Is there nobody who's sucessfully used tar -G option??? Post 302162334 by protienplant on Monday 28th of January 2008 08:46:45 PM
Old 01-28-2008
Java Is there ANYBODY who's sucessfully used tar -G option???

Has anyone you know ever used the -G --incremental option successfully with the tar command?

I'm not talking about the little -g --listed-incremental option. I don't want incremental backups. Just one differential backup which is what the -G is for. The -G command is supposed to make a single incremental archive based on the dump archive, when compared to the source directory that the dump archive was originally created from. The incremental archive should contain all files that have been modified since the original dump archive was taken.

Using tar with this option seems like a very prevalent and useful tool for a simple differential backup plan. I have devoured the man file for tar and the GNU tar manual GNU tar 1.19
They don't really say how to use it.

My biggest question is, where in the command do I say which dump.tar file it's supposed to compare to the source directory, in order to make the incremental or difference tar file?

Help is much appreciated.

Last edited by protienplant; 01-29-2008 at 01:31 AM..
 

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TAR(1)							      General Commands Manual							    TAR(1)

NAME
tar - The GNU version of the tar archiving utility SYNOPSIS
tar [ - ] A --catenate --concatenate | c --create | d --diff --compare | r --append | t --list | u --update | x -extract --get [ --atime- preserve ] [ -b, --block-size N ] [ -B, --read-full-blocks ] [ -C, --directory DIR ] [ --checkpoint ] [ -f, --file [HOSTNAME:]F ] [ --force-local ] [ -F, --info-script F --new-volume-script F ] [ -G, --incremental ] [ -g, --listed-incremental F ] [ -h, --dereference ] [ -i, --ignore-zeros ] [ -j, -I, --bzip ] [ --ignore-failed-read ] [ -k, --keep-old-files ] [ -K, --starting-file F ] [ -l, --one-file-sys- tem ] [ -L, --tape-length N ] [ -m, --modification-time ] [ -M, --multi-volume ] [ -N, --after-date DATE, --newer DATE ] [ -o, --old-ar- chive, --portability ] [ -O, --to-stdout ] [ -p, --same-permissions, --preserve-permissions ] [ -P, --absolute-paths ] [ --preserve ] [ -R, --record-number ] [ --remove-files ] [ -s, --same-order, --preserve-order ] [ --same-owner ] [ -S, --sparse ] [ -T, --files-from=F ] [ --null ] [ --totals ] [ -v, --verbose ] [ -V, --label NAME ] [ --version ] [ -w, --interactive, --confirmation ] [ -W, --verify ] [ --exclude FILE ] [ -X, --exclude-from FILE ] [ -Z, --compress, --uncompress ] [ -z, --gzip, --ungzip ] [ --use-compress-program PROG ] [ --block-compress ] [ -[0-7][lmh] ] filename1 [ filename2, ... filenameN ] directory1 [ directory2, ...directoryN ] DESCRIPTION
This manual page documents the GNU version of tar , an archiving program designed to store and extract files from an archive file known as a tarfile. A tarfile may be made on a tape drive, however, it is also common to write a tarfile to a normal file. The first argument to tar must be one of the options: Acdrtux, followed by any optional functions. The final arguments to tar are the names of the files or directories which should be archived. The use of a directory name always implies that the subdirectories below should be included in the archive. FUNCTION LETTERS
One of the following options must be used: -A, --catenate, --concatenate append tar files to an archive -c, --create create a new archive -d, --diff, --compare find differences between archive and file system --delete delete from the archive (not for use on mag tapes!) -r, --append append files to the end of an archive -t, --list list the contents of an archive -u, --update only append files that are newer than copy in archive -x, --extract, --get extract files from an archive OTHER OPTIONS
--atime-preserve don't change access times on dumped files -b, --block-size N block size of Nx512 bytes (default N=20) -B, --read-full-blocks reblock as we read (for reading 4.2BSD pipes) -C, --directory DIR change to directory DIR --checkpoint print directory names while reading the archive -f, --file [HOSTNAME:]F use archive file or device F (default /dev/rmt0) --force-local archive file is local even if has a colon -F, --info-script F --new-volume-script F run script at end of each tape (implies -M) -G, --incremental create/list/extract old GNU-format incremental backup -g, --listed-incremental F create/list/extract new GNU-format incremental backup -h, --dereference don't dump symlinks; dump the files they point to -i, --ignore-zeros ignore blocks of zeros in archive (normally mean EOF) -j, -I, --bzip filter the archive through bzip2. Note: -I is deprecated and may get a different meaning in the near future. --ignore-failed-read don't exit with non-zero status on unreadable files -k, --keep-old-files keep existing files; don't overwrite them from archive -K, --starting-file F begin at file F in the archive -l, --one-file-system stay in local file system when creating an archive -L, --tape-length N change tapes after writing N*1024 bytes -m, --modification-time don't extract file modified time -M, --multi-volume create/list/extract multi-volume archive -N, --after-date DATE, --newer DATE only store files newer than DATE -o, --old-archive, --portability write a V7 format archive, rather than ANSI format -O, --to-stdout extract files to standard output -p, --same-permissions, --preserve-permissions extract all protection information -P, --absolute-paths don't strip leading `/'s from file names --preserve like -p -s -R, --record-number show record number within archive with each message --remove-files remove files after adding them to the archive -s, --same-order, --preserve-order list of names to extract is sorted to match archive --same-owner create extracted files with the same ownership -S, --sparse handle sparse files efficiently -T, --files-from=F get names to extract or create from file F --null -T reads null-terminated names, disable -C --totals print total bytes written with --create -v, --verbose verbosely list files processed -V, --label NAME create archive with volume name NAME --version print tar program version number -w, --interactive, --confirmation ask for confirmation for every action -W, --verify attempt to verify the archive after writing it --exclude FILE exclude file FILE -X, --exclude-from FILE exclude files listed in FILE -Z, --compress, --uncompress filter the archive through compress -z, --gzip, --ungzip filter the archive through gzip --use-compress-program PROG filter the archive through PROG (which must accept -d) 30 October 2000 TAR(1)
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