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Operating Systems AIX AIX & TAR related stuff
# 8  
Old 02-24-2013
Quote:
Originally Posted by MichaelFelt
but it used to be if you restored a file using tar all the zero bytes that are not on disk actually get written to the "tape" AND these zero bytes get restored. (so called sparse files getting backed up and restored as "full" files.
This is true. From the AIX 6.1 manual:

Quote:
tar does not preserve the sparse nature of any file that is sparsely allocated. Any file that was originally sparse before the restoration will have all space allocated within the filesystem for the size of the file.
IMHO "tar" is a good device to bundle some files up to an archive. If one wants to bundle the source files for a software project or to create a snapshot of ones HOME-directory it is a tool worth considering. "tar" plays in the same league as "cpio", "pax" and probably some other tools, "backup" among them.

As Michael hinted at "tar" is platform-independent to a quite unparalleled degree. This is as much an advantage as it is a limiting factor because of some limitations. And for system-wide backups i would use "mksysb" and "savevg" solely under AIX - neither "tar" nor any of the other aforementioned programs.

Just my 2 cents.

bakunin
This User Gave Thanks to bakunin For This Post:
filosophizer
# 9  
Old 02-24-2013
Quote:
Originally Posted by bakunin
As Michael hinted at "tar" is platform-independent to a quite unparalleled degree.
tar is a lot like ps. Both tools are universally deployed, but if you cross platforms, only the most fundamental options will work. Attempt something non-trivial and any semblance of platform-independence evaporates.

Regards,
Alister
This User Gave Thanks to alister For This Post:
Skrynesaver
# 10  
Old 02-24-2013
As Alister (amck?) has said above, the problem with tar is that it has been implemented so often and so variously that options taken for granted in the GNU world aren't available everywhere.

However the GNU solution has (OS regardless) become the most useful solution and (in my opinion) the solution to a deficiency in your local tar is to install gnu tar(personal opinion, your mileage may vary, I'm right but you don't realise it yet(there's a culture ship name in there (though that'd be a cool culture ship name in its own right))
# 11  
Old 02-28-2013
10. Tar and ZIP the directory in one command

Code:
# tar cvf -  /oracle | gzip > /backup/oracle_backup.tgz
or
# tar cvf - /oracle | gzip > /oracle.tar.gz

If you are using GNU tar , you can say instead:
# tar cvzf oracle.tar.gz /oracle

v enables verbose out and is not necessary for the command to function. 
'f' states that the output is to go to a file that then is set to '-' 
(stdout) making tar write its output to stdout which is the default behavior without both 'f' and '-'.
# tar c /oracle | gzip > oracle.tar.gz

11. unTar and uncompress unZIP the directory in one command

Code:
gunzip < /backup/oracle_backup.tgz | tar -xvf -

OR
gunzip < /oracle/abc.tar.gz | tar xvf -

bzip2 < /oracle/abc.tar.bz2 | tar xvf -


12. Removing leading `/' from member names
sometimes
Code:
tar -cvf -  /oracle | gzip > /backup/oracle_backup.tgz
tar: Removing leading `/' from member names

which means:
1. warning message to tell you that it is writing a tar file without absolute paths.
This is because you cannot then relocate the data at a later date when you un-archive the file.
2. tar takes relative paths. The file paths in a tar archive are stored as relative paths for a good reason.
It gives you more flexibility about where to restore files. You may want to restore files into another location.
The relative path makes this possible.

See more here:
1. http://javarevisited.blogspot.com/20...x-example.html
2. http://shellscriptclub.blogspot.com/...mands-for.html
3. http://www.commandlinefu.com/commands/using/tar
Last edited by filosophizer; 09-19-2013 at 07:25 AM..
# 12  
Old 04-07-2013
13. Tar and ZIP -- multiple directories in one command

we have directories
/oracle
/oracle1
/oracle2

Code:
tar -cvf -  /oracle /oracle1 /oracle2 | gzip > /backup/oracle_backup.tgz



14. unTar and unZIP -- one specific directory from the tar archive in one command

Can someone help with this one. How to untar unzip from oracle_backup.tgz one specific folder which is oracle2 ?

thanks
# 13  
Old 04-08-2013
Quote:
Originally Posted by filosophizer
unTar and unZIP -- one specific directory from the tar archive in one command
gzip -cd <file> unzips from a file to <stdout> This data stream can be fed to "tar".

tar -x <dir> extracts <dir> and all files containing it from a tar archive.

Hence:

Code:
gzip -cd oracle_backup.tgz | tar -xf - /oracle2

I hope this helps.

bakunin
# 14  
Old 08-28-2013
zip and tar size compressed check
15. How to find the total size of the uncompressed tar zipped file oraclebackup.tgz

oraclebackup.tgz was created using the following command, which gave me 40GB file

Code:
# /opt/freeware/bin/tar -cvf -  /oracle | gzip > /backup/oraclebackup.tgz

Now, if someone wants to check how much space is needed to untar and uncompress the file oraclebackup.tgz how can he check ?

thanks
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