A data compression program. Originally a GNU utility it has been cloned by most Unix variants.

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18
votes
3answers
31k views

Add/update a file to an existing tar.gz archive?

Is there a way to add/update a file in a tar.gz archive? Basically, I have an archive which contains a file at /data/data/com.myapp.backup/./files/settings.txt and I'd like to pull that file from the ...
0
votes
2answers
42 views

Unzipping appearing to fail

I run: ~$ gzip -d Mom.img.gz ^C ~$ I created Mom.img.gz by piping a dd to gzip. Should I be seeing output? I tried it with the GUI too, and the progress bar didn't move.
8
votes
4answers
8k views

How to uncompress zlib data in UNIX?

I have created zlib-compressed data in Python, like this: import zlib s = '...' z = zlib.compress(s) with open('/tmp/data', 'w') as f: f.write(z) (or one-liner in shell: echo -n '...' | python2 ...
0
votes
2answers
74 views

OpenMeetings latest release not unzipping

I am trying to install OpenMeetings for centos 6.5 32 bit but everytime I try to untar or unzip the latest binary release I get the following error: tar -xzvf apache-openmeetings-3.0.0.tar.gz gzip: ...
3
votes
2answers
30 views

TAR: better to skip directory or use split

I've got a file.tar.gz that I create and backup to Amazon S3. It's gotten bigger than Amazon's limits and thus has not been backing up. This is my current command: tar -cpzf file.tar.gz directory/ ...
2
votes
2answers
63 views

How can I flatten nested .tar.gz files?

I've got a bunch of .tar.gz files in different paths. I'd like to create a new .tar.gz file at some common ancestor of them and I don't want it to be composed of nested .tar.gz files. How can I easily ...
1
vote
1answer
134 views

Error with a .gz file decompression in Mint, but works perfectly in Windows, so the file is not corrupt

I've downloaded some .csv files from the OECD Stats website, since I need them to plot some graphs with gnuplot. When I open them with File Roller 3.4.1 (the default program to handle archive files), ...
1
vote
2answers
55 views

Uncompress files when rsync'in

I have 22,000 gzip files on a remote server, which I would like to trasnfer to my machine. I would also like to uncompress these files before/while transferring. Is it possible? My rsync command ...
29
votes
3answers
16k views

How to tell gzip to keep original file?

I would like to compress a text file using gzip command line tool while keeping the original file. By default running the following command gzip file.txt results in modifying this file and renaming ...
1
vote
2answers
35 views

portable command to unzip and untar on non GNU and old unix

On AIX 6.1 without GNU Tool installed I have a .tar.gz file. On Ubuntu I would use the very useful command : tar xzf myfile.tar.gz but in this case the z switch is not possible. I do remeber a ...
-5
votes
2answers
2k views

ungzip the gizpped war

I am totally new to linux. I have gzipped a war file like this gzip mytest.war. I try to ungzip it like it --ungzip mytest.war.gz, it said command can't be found. How can I ungzip it? Moreover, how ...
14
votes
5answers
894 views

Is there a tool that combines zcat and cat transparently?

When handling log files, some end up as gzipped files thanks to logrotate and others not. So when you try something like this: $ zcat * you end up with a command line like zcat xyz.log xyz.log.1 ...
57
votes
4answers
4k views

Why are tar archive formats switching to xz compression to replace bzip2 and what about gzip?

More and more tar archives use the xz format based on LZMA2 for compression instead of the traditional bzip2(bz2) compression. In fact kernel.org made a late "Good-bye bzip2" announcement, 27th Dec. ...
3
votes
2answers
8k views

Can I zip an entire folder using gzip?

I'm trying to zip a folder in unix. Can that be done using the gzip command?
3
votes
3answers
842 views

speed up gzip compression

Is it possible to speed up the gzip process? I'm using mysqldump "$database_name" | gzip > $BACKUP_DIR/$database_name.sql.gz to backup a database into a directory, $BACKUP_DIR. the manpage ...
9
votes
5answers
10k views

tar: Removing leading `/' from member names

root@server # tar fcz bkup.tar.gz /home/foo/ tar: Removing leading `/' from member names How can I solve this problem and keep the / on file names ?
3
votes
1answer
250 views

Speed up zgrep on a multi-core computer

I'm running zgrep on a computer with 16 CPUs, but it only takes one CPU to run the task. Can I speed it up, perhaps utilize all 16 cores? P.S The IO is just fine, I could just copy the gzipped file ...
0
votes
2answers
222 views

Is it safe to assume the tar.gz file is healthy?

I have a rather large tar.gz file (17GB) which is a tar.gz version of a directory. The problem here is I got the following message after the tar operation. tar: Error exit delayed from previous ...
2
votes
3answers
202 views

zcat a file line by line? [closed]

I have written a C++ application that reads files line by line. It reads one line, does processing, then reads the next line. I would like to add support for gzipped files, and am looking to an ...
5
votes
3answers
1k views

Efficiently remove file(s) from large .tgz

Assume i have an gzip compressed tar-ball compressedArchive.tgz (+100 files, totaling +5gb). What would be the fastest way to remove all entries matching a given filename pattern for example ...
1
vote
1answer
150 views

Blocking gzip HTTP content with Iptables or Snort?

I'm looking to drop a connection if a website contains a certain word or phrase. The issue is, the site is typically compressed with gzip. Any ideas?
4
votes
2answers
198 views

Extract timestamp from a gzip file

How can I know the raw original timestamp of a file foo compressed with gzip without having to decompress foo.gz? gzip --verbose --list foo.gz and file foo.gz will print formatted date and time.
1
vote
1answer
924 views

gunzip multiple compressed files to another directory without deleting the .gz files

I have multiple .gz file in a folder and I want to unzip it in other folder through gunzip without deleting parent file. Please help.
1
vote
2answers
252 views

Chaining mysqldumps commands to output a single gzipped file

Let's say I have these series of commands mysqldump --opt --databases $dbname1 --host=$dbhost1 --user=$dbuser1 --password=$dbpass1 mysqldump --opt --databases $dbname2 --host=$dbhost1 --user=$dbuser1 ...
12
votes
2answers
1k views

Why does the gzip version of files produce a different md5 checksum

I have four files that I created using an svndump test.svn test2.svn test.svn.gz test2.svn.gz now when i run this md5sum test2.svn test.svn test.svn.gz test2.svn.gz Here is the output ...
7
votes
1answer
710 views

Under what circumstances does gunzip & tar xf work but tar xzf fail?

To illustrate the point: I have downloaded the LEDA library from the company's website. Using tar -xzf on it fails: $ tar -xzf LEDA-6.3-free-fedora-core-8-64-g++-4.1.2-mt.tar.gz tar: This does not ...
3
votes
8answers
2k views

Triple compression and I only save 1% in space?

I've been trying to save space on my linux server, and I had a folder containting, in subfolders, 22GB of images. So I decided to compress them. First I used tar: tar -zcf folder.tar folder Then ...
2
votes
1answer
590 views

How to create a gzip file without .gz file extension?

I would like to create a gzipped file that retains the original file name. For example gzipping "example.txt" should output a gzipped file named "example.txt" rather than "example.txt.gz." Is it ...
0
votes
1answer
808 views

How to disable gzip compression with wget?

There are other questions asking how to enable gzip compression with wget, and lots of web pages out there telling how to do this, but I need the opposite. I'm trying to locally mirror a site, and ...
3
votes
2answers
359 views

How to bzip a file with minimum cpu percentage?

I am using bzip2 to compress a file,the process takes more that 100% cpu.Is there any way to run bzip2 with minimum CPU precentage.
3
votes
3answers
812 views

How can I check if two gzipped files are equal?

I am trying to save space while doing a "dumb" backup by simply dumping data into a text file. My backup script is executed daily and looks like this: Create a directory named after the backup date. ...
0
votes
1answer
106 views

How to safely enlarge a gzipped file?

I have a gzipped file (around 3Kb), and I want its size to be exactly 4000. To achieve this goal, is it safe to add trailing padding with zeroes? (By safe I mean that the content of the gzipped file ...
0
votes
2answers
146 views

How to uncompress a gzip file with a custom extension?

I have a file called file1.atz. I know that it is gzipped. The uncompressed file extension should be .ats. I have read the man pages and I just want to verify I'm uncompressing this correctly, because ...
2
votes
2answers
4k views

How to recover a corrupted “tar.gz” file

I suddenly needed to recover an old tar.gz file, but as soon as I execute so: tar -zxvf filename.tar.gz I get this: gzip: stdin: invalid compressed data--format violated tar: Child returned ...
1
vote
2answers
5k views

Compress old log file into single zip-linux

I have a folder /home/testuser/log which contain log files of one day old *.log. I wish to compress all the log files older than one day to a single zip(gzip or tar.gz) and delete the older files. I ...
1
vote
1answer
220 views

mirror a site with wget that only response with gzip

I'm trying to mirror a site but the server only responses with gzip pages so wget won't recurse. I've searched around and there are some references to a patch to add gzip support to wget however they ...
2
votes
1answer
396 views

Subprocess.call() and gunzip error

I'm trying to use Python's package subprocess to gunzip and gzip files. I'm using the following command: subprocess.call(['gunzip', a_path+myfile_gz], shell=True) Then I get the error message: ...
6
votes
5answers
9k views

How can i view the contents of a tar.gz file (filenames + filesize)

I cannot use tar -tz as the solaris version I'm using does not accept the -z option. I tried something like gunzip file.tar.gz | tar -tv but that only gives: tar: /dev/rmt/0: No such file or ...
2
votes
1answer
3k views

gunzip all .gz files in directory

I have a directory with plenty of .txt.gz files (where the names do not follow a specific pattern.) What is the simplest way to gunzip them? I want to preserve their original names, so that they go ...
1
vote
2answers
3k views

tar: Unexpected EOF in archive

I am trying extract .tar.gz file it but with no luck gzip: stdin: unexpected end of file tar: Unexpected EOF in archive tar: Unexpected EOF in archive tar: Error is not recoverable: exiting now the ...
0
votes
1answer
2k views

bash script to gzip files

I have to make a bash script that do a gzip of a file if is older than 60 days, and move it in a subdir which name is the beginning of the filename. Here an example of the files I have to work with: ...
3
votes
1answer
352 views

tar: exclude gzip file, and don't try to gunzip it

I would like to skip a large gzip file when I extract a tar file, but everytime tar starts to gunzip it to look inside it seems. Even when I just try to peek inside tar seems to start gunzipping it, ...
4
votes
2answers
650 views

diff a gzipped tarball against a directory?

Is there a way I can diff a gzipped tarball against an existing directory? I would like to be able to do it without extracting the data from the tarball.
4
votes
4answers
1k views

How can I check if a gzipped file is empty?

Is there a quick way to check if a gzipped file is empty, or do I have to unzip it first? example: $ touch foo $ if [ -s foo ]; then echo not empty; fi $ gzip foo $ if [ -s foo.gz ]; then echo not ...
0
votes
2answers
725 views

Combination of ls, xargs and zcat leads to duplicate file name suffixes?

Disclaimer: Yes, finding files in a script with ls is bad, but find can't sort by modification date. Using ls and xargs with echo everything is fine: $ ls -t1 ssl-access*.gz | xargs -n 1 echo ...
3
votes
1answer
2k views

Gunzip multiple files and rename them

I want to know whether it is possible to gunzip multiple files and rename them with one command/script. I have a bunch of files in the format: test.20120708191601.DAT.3599502593.gz ...
3
votes
2answers
570 views

Search for files with a specific size inside recursive zipped archives

I have a folder with several files. These files are either .xml or .zip files. These .zip files contain .xml and/or .zip files. These .zip contains also .xml or .zip, and so on... until we finally ...
7
votes
2answers
7k views

Is it possible to compress a very large file (~30 GB) using gzip?

Is it possible to compress a very large file (~30 GB) using gzip? If so, what commands, switches, and options should I use? Or is there another program (preferably one commonly available on Ubuntu ...
5
votes
5answers
1k views

Unix bash script check empty gz files

I'm trying to write a bash script that will go into a directory loop through the .gz files and delete them if they are empty (ie the uncompressed file contained within in empty. I've got a couple of ...
12
votes
1answer
14k views

How do you extract a single folder from a large tar.gz archive?

I am using this command on a 5GB archive tar -zxvf archive.tar.gz /folder/in/archive is this the correct way to do this? It seems to be taking forever with no command line output...