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

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1answer
20 views

How to replace string of the file, which is present in tar file through UNIX

I have a tar archive xyz.tar containing lots of .sh files like: 123.sh 456.sh 789.sh Every .sh file has some string content, e.g. 123.sh contains welcome to Hollywood, 456.sh contains I love ...
0
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2answers
42 views

Gzip file but excluding some directories|files and also append current date

I'm looking for a way to create a .tar.gz file from a directory but I have some doubts. I'm know that the command for create the file is: tar -zcvf /path/to/compressed/file.tar.gz /path/to/compress ...
7
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4answers
12k 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 ...
3
votes
2answers
672 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 ...
12
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2answers
262 views

Fastest way of working out uncompressed size of large GZIPPED file

Once a file is gzipped, is there a way of quickly querying it to say what the uncompressed file size is (without decompressing it), especially in cases where the uncompressed file is > 4GB in size. ...
1
vote
1answer
19 views

Is there a difference between gunzip -c and gunzip in terms of system utilization?

Is there a difference between zcat/gunzip -c and gunzip apart from the obvious one that one outputs it to the terminal and the other decompresses it to a file? I'm looking from a CPU utilization ...
0
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0answers
28 views

Sometimes tar -x doesn't overwrite existing files in the same directory, what would cause this? [on hold]

I have occasionally run into an issue if I go to untar an archive and the contents in the tar already exist in the same directory it will not always overwrite the old file(s) or directories. What ...
1
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3answers
112 views

Gunzip in range of files

I'm running a long copy of .gz files from one server to another. At the same time, I'd like to unzip the files already copied. For example, al filenames that start with a through filenames starting ...
5
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4answers
7k 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 ...
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4answers
16k 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 ...
2
votes
2answers
36 views

How to gunzip files present in multiple subdirectories in subdirectories

I am learning Linux and I was trying the gzip command. I tried it on a folder which has a hierarchy like Personal/Folder1/file1.amr Personal/Folder2/file2.amr Personal/Folder3/file3.amr ...
4
votes
2answers
10k 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 ...
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votes
2answers
51 views

Gzip Mutliple files using single command [closed]

Want to Gzip my all the .csv files into a gzip file. I am using this command. gzip *.csv; Problem File contains '//' in its name that's why command is giving error. Error : - '//File.csv' is not ...
6
votes
5answers
1k 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 ...
49
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2answers
158k 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?
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0answers
73 views

how to write dd command to replace backup image of root partition?

I have installed rhel6.5 in my pc. After that I have changed some configurations in file system. now I have taken backup image of /dev/sda1 which is a root partition of 15gb in size using the command ...
2
votes
1answer
49 views

Payload size of a gzip archive

Is there any way to check the normal size of the compressed datasets (.gz) without decompressing it? For example, I have 50 large .gz files (in total 50 Gb) that can't be decompressed due to storage ...
3
votes
2answers
115 views

Less resource hungry alternative for piping `cat` into gzip for huge files

I have some files of which some are very large (like several GB), which I need to concatenate to one big file and then zip it, so something like this: cat file1 file2 file3 file4 | gzip > ...
4
votes
1answer
85 views

How come zipping a created disk image, makes smaller files than piping?

Case 1. I use dd to create an image: dd if=/dev/rdiskx of=/path/to/image bs=1m. It's 16 GB in size. I zip it, and it's suddenly around 100 MB. Case 2. I use dd to create an image, piping it ...
3
votes
1answer
239 views

Estimate the size of the extracted files before extraction a `tar.gz` archive?

Before using tar to extract a .tar.gz archive, it is possible to get an estimate of how large the extracted files are in total?
1
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1answer
1k views

Why I get unexpected end of file in my script when using gzip?

I have one doubt with this: for i in ./*.gz do gunzip -c $i | head -8000 | gzip > $(basename $i) done I get an "unexpected end of file" error for gzip, and I don't get the 8000 at all, only a ...
20
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6answers
2k 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 ...
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2answers
139 views

command to get topmost directory name in compressed files

Filenames are ones shown below, but the directory will be libgit2-0.21-1 when tar xvf v0.21.1.tar.gz, so how use one-liner to get the directory name(report error if more than two directory exist): ...
3
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1answer
132 views

How to create a deterministic tar.gz using git-archive?

Creating a git repository for testing. ~ $ mkdir somefolder ~ $ cd somefolder/ ~/somefolder $ git init Initialized empty Git repository in /home/user/somefolder/.git/ ~/somefolder $ echo test > ...
10
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1answer
822 views

Use gzip to compress a directory except for already existing .gz files in the directory

I have a directory of logs that I would like to set up a job to compress using gzip. The issue is I don't want to recompress the logs I've already compressed. I tried using ls | grep -v gz | gzip, ...
4
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4answers
603 views

Does gzip add integrity/crc check to a .tar?

I run commands: tar -cf myArchive.tar myDirectory/ gzip myArchive.tar then I copy the file over a lot of unreliable mediums, and later I unpack it using: tar -xzf myArchive.tar.gz The fact that ...
0
votes
1answer
194 views

moving files to a folder and zip the folder

I have to zip a few files induvidually from folder A and move them to folder B on the same directory which takes lot of time. So I thought of moving all those files to be zipped to a new folder(c), ...
0
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2answers
194 views

touch & gzip all HTML, CSS, JS files in a directory recursively

I'm trying to optimize Nginx server. I've enabled Gzip_Static_Module to serve pre-compressed gzip static files like CSS, JS, HTML. Nginx Wiki says that the timestamps of the compressed and ...
0
votes
2answers
236 views

How to combine gunzipped fastq files?

How can I combine gzipped fastq files? I tried this for read 1 and read 2 zcat file_1.fastq.gz file_2.fastq.gz | gzip > combined.fastq.gz but it is giving me unequal number of reads. Why? Is ...
0
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2answers
61 views

Automatic extraction of zip files like in osx

In Mac OSX if you have downloaded a zip/gz/bz2 file, and you double click it in Finder, then the archive is automatically extracted for you in a subfolder, which I find very nice. I am wondering if ...
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2answers
174 views

I accidentally GZIPed a whole bunch of files, one by one, instead of using tar(1). How can I undo this mess?

I'm new to the gzip command, so I googled some commands to run so I can gzip an entire directory recursively. Now while it did that, it converted each of my files to the gzip format and added .gz to ...
1
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2answers
335 views

Unzipping a .gz file without removing the gzipped file

I have file.gz, when I try to unzip this file by using gunzip file.gz, it unzipped the file but only contains extracted and removes the file.gz file. How can I unzip by keeping both unzipped file and ...
2
votes
2answers
190 views

Estimate compressibility of file

Is there a quick and dirty way of estimating gzip-compressibility of a file without having to fully compress it with gzip? I could, in bash, do bc <<<"scale=2;$(gzip -c file | wc -c)/$(wc ...
4
votes
2answers
311 views

can't decompress .tgz using gunzip

I was able to archive and compress a folder with the following command: tar -cvfz example2.tgz example1 I then removed the example1 folder and tried to unpack the archive using this command: tar ...
0
votes
0answers
1k views

cuda - gzip: stdin: invalid compressed data--format violated

I downloaded cuda toolkit from here! I'm running on 32-bit Linux(Mint 17). I had to download .run file(the downloaded file name is ...
0
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0answers
112 views

Terminal freezes after using tar or gz

On Linux within bash the Pseudo Terminal window (terminator) as well as the Terminal itself "freezes" when trying to use autocomplete (TAB) as well as after getting an error message using gzip and ...
3
votes
4answers
494 views

gunzip a folder with many files

I have a folder with 36,348 files gz files. I want to unzip all of them. Running: gunzip ./* results in -bash: /usr/bin/gunzip: Argument list too long Whats the easiest way to get around ...
0
votes
3answers
259 views

How do you view a sql.gz file as plain text SQL from the command line?

How do you view a sql.gz file as plain text SQL from the command line? I want to read the SQL statements stored in a .sql.gz file, from the command line on the server. I've tried tar -xzvf, but get ...
2
votes
3answers
2k views

How do I use gunzip and tar to extract my tar.gz file to the specific directory I want?

When I run gunzip -dc /path_to_tar.gz_file/zip1.tar.gz | tar xf - in the directory where the tar.gz file is located, it extracts just fine. How do I tell it to place the contents from the tar.gz file ...
79
votes
3answers
13k 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. ...
6
votes
6answers
14k 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 ...
3
votes
2answers
569 views

Gzip large amount of symlinked files

I have a folder containing a large amount of symlinked files. These files are each on the order of 10-11GB (fastq files to be specific). They come from a variety of source folders, but I made sure ...
4
votes
1answer
8k 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 ...
0
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0answers
120 views

Unix gunzip decompression [closed]

So this is a very annoying problem, I have a file in the Linux terminal ERR091571_1.fastq.gz And I run gunzip on it to decompress the file... gunzip ERR091571_1.fastq.gz But all that happens is ...
15
votes
5answers
1k views

Is it possible to make zcat output text even if it's uncompressed? [duplicate]

The problem is I have some database dumps which are either compressed or in plain text. There is no difference in file extension etc. Using zcat on uncompressed files produces an error instead of the ...
23
votes
1answer
30k 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...
0
votes
0answers
160 views

Extract specific folder from a tar.gz

I know this question was previously asked on this site before like here 1 and here 2 but no success for me. I want to extract the Measures folder from my S012011_csv.tar.gz zipped file. If I do tar ...
22
votes
3answers
54k 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
87 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.
0
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2answers
173 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: ...