08-07-2013
Explain difference of tar command
Hello All,
I have been seeing a weird(at least for me, at this point) issue with a specific tar command.
1st fashion)
Normally, if i have to tar anything at the command line I tend to use
tar -cvzf <tar-file_name.tgz> <directory_to_be_tarred>
this command works perfectly fine with out any problem or hiccups.
2nd fashion)
I then had a situation where i needed only the files to be tarred and had to exclude the directory name under which the file were being tar'ed
for example:
my_directory
--- my_file
--- my_file
--- my_file
I only had to tar the files, did some search and ended up using the belowcommand
tar -cvjf <my_directory.tar.gz> -C <my_directory> .
where: The -C my_directory tells tar to change the current directory to my_directory, and then . means "add the entire current directory"
Now the issue: Couple of these file are 7GB and 4GB, when I do the tar in the first fashion the tar ball get created under 10 minutes, but when I use the 2nd fashion the creation of tar ball takes significant amount of time, on an avaerage it take 90 minutes to complete the tar ball.
Wanted to understand why this happens and what needs to be done to correct it.
Please advice.
---------- Post updated at 10:18 AM ---------- Previous update was at 10:02 AM ----------
Is the difference due to
tar -cvzf (1st fashion)
against
tar -cvjf (2nd fashion)
Last edited by getnetha; 08-07-2013 at 12:06 PM..
Reason: Format and spelling correction done
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LEARN ABOUT CENTOS
git-tar-tree
GIT-TAR-TREE(1) Git Manual GIT-TAR-TREE(1)
NAME
git-tar-tree - Create a tar archive of the files in the named tree object
SYNOPSIS
git tar-tree [--remote=<repo>] <tree-ish> [ <base> ]
DESCRIPTION
THIS COMMAND IS DEPRECATED. Use git archive with --format=tar option instead (and move the <base> argument to --prefix=base/).
Creates a tar archive containing the tree structure for the named tree. When <base> is specified it is added as a leading path to the files
in the generated tar archive.
git tar-tree behaves differently when given a tree ID versus when given a commit ID or tag ID. In the first case the current time is used
as modification time of each file in the archive. In the latter case the commit time as recorded in the referenced commit object is used
instead. Additionally the commit ID is stored in a global extended pax header. It can be extracted using git get-tar-commit-id.
OPTIONS
<tree-ish>
The tree or commit to produce tar archive for. If it is the object name of a commit object.
<base>
Leading path to the files in the resulting tar archive.
--remote=<repo>
Instead of making a tar archive from local repository, retrieve a tar archive from a remote repository.
CONFIGURATION
tar.umask
This variable can be used to restrict the permission bits of tar archive entries. The default is 0002, which turns off the world write
bit. The special value "user" indicates that the archiving user's umask will be used instead. See umask(2) for details.
EXAMPLES
git tar-tree HEAD junk | (cd /var/tmp/ && tar xf -)
Create a tar archive that contains the contents of the latest commit on the current branch, and extracts it in /var/tmp/junk directory.
git tar-tree v1.4.0 git-1.4.0 | gzip >git-1.4.0.tar.gz
Create a tarball for v1.4.0 release.
git tar-tree v1.4.0^{tree} git-1.4.0 | gzip >git-1.4.0.tar.gz
Create a tarball for v1.4.0 release, but without a global extended pax header.
git tar-tree --remote=example.com:git.git v1.4.0 >git-1.4.0.tar
Get a tarball v1.4.0 from example.com.
git tar-tree HEAD:Documentation/ git-docs > git-1.4.0-docs.tar
Put everything in the current head's Documentation/ directory into git-1.4.0-docs.tar, with the prefix git-docs/.
GIT
Part of the git(1) suite
Git 1.8.3.1 06/10/2014 GIT-TAR-TREE(1)