Again, this does not save the entire uncompressed archive to disk. And, of course, if you try this and find that it gives you the list of files you want, you could try:
as long as the list of filenames to be processed doesn't cause that command line to overflow your system's ARG_MAX limit.
It looks to me like your grep regular expression is underspecified, because D.*T is allowed to span pathname components. [^/] seems a better choice.
Regarding avoiding ARG_MAX, one filename per line can be read from a file, using GNU tar's -T or BSD tar's -I. Perhaps other implementations offer similar functionality.
To the OP:
When asking for help with tar, always specify the implementation you're using (or at least the operating system). Aside from core functionality, tar isn't well standardized.
If you're using GNU tar (untested):
Regards,
Alister
Dear experts
I have received a tar file containing several files with full path. Now I need to restore it in another system but when I want to extract files by using
tar -xvf tarfile
it wants to create all files with full paths again in new system in which I don't have enough previleges.
How... (4 Replies)
Can I extract files from an archive file (tar), where the filename includes the full directory path, to a different directory?
For example the archive files may have a filename of
/SrcFiles/XXX/filename.dat
and I want to extract it to /SrcFiles/YYY/filename.dat. Since the archive file... (1 Reply)
Can I extract files from an archive file (tar), where the filename includes the full directory path, to a different directory?
For example the archive files may have a filename of
/SrcFiles/XXX/filename.dat
and I want to extract it to /SrcFiles/YYY/filename.dat. Since the archive file was... (1 Reply)
Hi All,
I want to read the content of the particular file from tar.Z without extracting.
aaa.tar.Z contains a file called one.txt, I want to read the content of the one.txt without extracting.
Please help me to read the content of it.
Regards,
Kalai. (12 Replies)
Hi Gurus,
I have a .tar file which required untar to the new location. I list the content with –tvf its listing the files which are inside the tar, when I am extracting he file from tar its working fine, however once I am trying to extract the file at the new location I am unable to do so. I... (11 Replies)
I have tried:
tar -xfv mytarfile.tar archive/tabv/*
tar -xfv mytarfile.tar --wildcards 'archive/tabv/*'
tar -xf mytarfile.tar -v --wildcards 'archive/tabv/*'
tar -xfv mytarfile.tar --wildcards --no-anchored 'archive/tabv/*'
tar -xfv mytarfile.tar --wildcards `archive/tabv/*`
and none... (5 Replies)
Hi,
I want to tar files and zip them in order to clean up space in directory. I have files like /path/file1 /path file2.
What I am trying to do is:
Option 1:
tar -cvf /path/file1 /path file2 | gzip > test.tar.gz
I got the file created. But while trying to extract the Tar and zipped file, I... (1 Reply)
I was extracting the zipped tar file with the command
gzip -dc Sample.tar.gz |tar xf -
The tar file contained many delimited files; but lately they changed the structure of the tar file with another folder. So now all the delimited files are inside a folder called "Folder1" and the folder... (6 Replies)
Hi
I have a few hundred files with extension .tar.Z. These files were archived (tar) and compressed (Z) on a UNIX system. I need to unzip them but not extract them. In other words they need to go to .tar extension. I would like to do this on my MAC or on a windows pc. I do not have a UNIX... (3 Replies)
Discussion started by: kalbano
3 Replies
LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS --predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO bup-midx(1), bup-save(1)BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown-bup-margin(1)