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Full Discussion: .tar and .tar.gz
Operating Systems AIX .tar and .tar.gz Post 302189194 by grial on Friday 25th of April 2008 07:50:43 AM
Old 04-25-2008
Quote:
Originally Posted by jim mcnamara
.tar is not compressed at all, it is just an archive format.
Exactly. A tar file is like a "package" but not compressed at all.
A .tar.gz (or .tgz in some cases) is just a gzip compressed tar file.
Quote:
Originally Posted by jim mcnamara
Linux (GNU tar) has non-standard extensions added to tar that other implmentations of tar do not have.
In this case, that extension is the "z" flag. Have a look to gtar man pages.
Quote:
Originally Posted by jim mcnamara
If the extra typing is a problem write a short shell script to do it.
For instance, in one line:
gzip -c myfile.tar.gz | tar xvf -
or
tar cvf - whatever | gzip -c > myfile.tar.gz
Regards.
 

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chroot(1M)						  System Administration Commands						chroot(1M)

NAME
chroot - change root directory for a command SYNOPSIS
/usr/sbin/chroot newroot command DESCRIPTION
The chroot utility causes command to be executed relative to newroot. The meaning of any initial slashes (/) in the path names is changed to newroot for command and any of its child processes. Upon execution, the initial working directory is newroot. Notice that redirecting the output of command to a file, chroot newroot command >x will create the file x relative to the original root of command, not the new one. The new root path name is always relative to the current root. Even if a chroot is currently in effect, the newroot argument is relative to the current root of the running process. This command can be run only by the super-user. RETURN VALUES
The exit status of chroot is the return value of command. EXAMPLES
Example 1 Using the chroot Utility The chroot utility provides an easy way to extract tar files (see tar(1)) written with absolute filenames to a different location. It is necessary to copy the shared libraries used by tar (see ldd(1)) to the newroot filesystem. example# mkdir /tmp/lib; cd /lib example# cp ld.so.1 libc.so.1 libcmd.so.1 libdl.so.1 libsec.so.1 /tmp/lib example# cp /usr/bin/tar /tmp example# dd if=/dev/rmt/0 | chroot /tmp tar xvf - ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
cd(1), tar(1), chroot(2), ttyname(3C), attributes(5) NOTES
Exercise extreme caution when referencing device files in the new root file system. References by routines such as ttyname(3C) to stdin, stdout, and stderr will find that the device associated with the file descriptor is unknown after chroot is run. SunOS 5.11 15 Dec 2003 chroot(1M)
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