Expanding on what Corona688 said, your two commands:
decompress the file twice (maybe not completing the first decompression), and if you find that there is some data in that file that you need, you'll then decompress it again for your awk script to process.
I would strongly suggest creating a separate text file that contains the timestamp of the first record in each compressed file and the name of that compressed file. (And, add a new entry to the end of that file each time you create a new compress log file.) Then you can look at that (uncompressed) text file to quickly determine which compressed file(s) you need to uncompress and feed to your awk script to get the records you want for any particular timestamp range.
This User Gave Thanks to Don Cragun For This Post:
hii everyone ,
i have a file in which i have line numbers.. file name is file1.txt
aa bb cc "12" qw
xx yy zz "23" we
bb qw we "123249" jh
here 12,23,123249. is the line number
now according to this line numbers we have to print lines from other file named... (11 Replies)
Hi,
I'm trying to figure out the best solution to the following problem, and I'm not
yet that much experienced like you. :-)
Basically I have to read a fairly large file, composed of "messages" , in order
to display all of them through an user interface (made with QT).
The messages that... (3 Replies)
We just set up a system to use large pages. I want to know if there is a command to see how much of the memory is being used for large pages. For example if we have a system with 8GB of RAm assigned and it has been set to use 4GB for large pages is there a command to show that 4GB of the *GB is... (1 Reply)
Hello
I have the following files
VOICE_hhhh
SUBSCR_llll
DEL_kkkk
Consider that there are 1000 VOICE files+1000 SUBSCR files+1000DEL files
When i try to tar these files using
tar -cvf backup.tar VOICE* SUBSCR* DEL*
i get the error:
ksh: /usr/bin/tar: arg list too long
How can i... (9 Replies)
Hello,
Error
awk: Internal software error in the tostring function on TS1101?05044400?.0085498227?0?.0011041461?.0034752266?.00397045?0?0?0?0?0?0?11/02/10?09/23/10???10?no??0??no?sct_det3_10_20110516_143936.txt
What it is
It is a unix shell script that contains an awk program as well as... (4 Replies)
Hi All,
I have some 80,000 files in a directory which I need to rename. Below is the command which I am currently running and it seems, it is taking fore ever to run this command. This command seems too slow. Is there any way to speed up the command. I have have GNU Parallel installed on my... (6 Replies)
awk "/May 23, 2012 /,0" /var/tmp/datafile
the above command pulls out information in the datafile. the information it pulls is from the date specified to the end of the file.
now, how can i make this faster if the datafile is huge? even if it wasn't huge, i feel there's a better/faster way to... (8 Replies)
I have script like below, who is picking number from one file and and searching in another file, and printing output.
Bu is is very slow to be run on huge file.can we modify it with awk
#! /bin/ksh
while read line1
do
echo "$line1"
a=`echo $line1`
if
then
echo "$num"
cat file1|nawk... (6 Replies)
This basic code works.
I have a very long list, almost 10000 lines that I am building into the array. Each line has either 2 or 3 fields as shown in the code snippit. The array elements are static (for a few reasons that out of scope of this question) the list has to be "built in".
It... (5 Replies)
I have the below command which is referring a large file and it is taking 3 hours to run. Can something be done to make this command faster.
awk -F ',' '{OFS=","}{ if ($13 == "9999") print $1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12 }' ${NLAP_TEMP}/hist1.out|sort -T ${NLAP_TEMP} |uniq>... (13 Replies)
Discussion started by: Peu Mukherjee
13 Replies
LEARN ABOUT OSX
gunzip
GZIP(1) BSD General Commands Manual GZIP(1)NAME
gzip -- compression/decompression tool using Lempel-Ziv coding (LZ77)
SYNOPSIS
gzip [-cdfhkLlNnqrtVv] [-S suffix] file [file [...]]
gunzip [-cfhkLNqrtVv] [-S suffix] file [file [...]]
zcat [-fhV] file [file [...]]
DESCRIPTION
The gzip program compresses and decompresses files using Lempel-Ziv coding (LZ77). If no files are specified, gzip will compress from stan-
dard input, or decompress to standard output. When in compression mode, each file will be replaced with another file with the suffix, set by
the -S suffix option, added, if possible.
In decompression mode, each file will be checked for existence, as will the file with the suffix added. Each file argument must contain a
separate complete archive; when multiple files are indicated, each is decompressed in turn.
In the case of gzcat the resulting data is then concatenated in the manner of cat(1).
If invoked as gunzip then the -d option is enabled. If invoked as zcat or gzcat then both the -c and -d options are enabled. When invoked
as zcat, ``.Z'' will be appended to all filenames that do not have that suffix.
This version of gzip is also capable of decompressing files compressed using compress(1) or bzip2(1).
OPTIONS
The following options are available:
-1, --fast
-2, -3, -4, -5, -6, -7, -8
-9, --best These options change the compression level used, with the -1 option being the fastest, with less compression, and the -9
option being the slowest, with optimal compression. The default compression level is 6.
-c, --stdout, --to-stdout
This option specifies that output will go to the standard output stream, leaving files intact.
-d, --decompress, --uncompress
This option selects decompression rather than compression.
-f, --force This option turns on force mode. This allows files with multiple links, symbolic links to regular files, overwriting of
pre-existing files, reading from or writing to a terminal, and when combined with the -c option, allowing non-compressed
data to pass through unchanged.
-h, --help This option prints a usage summary and exits.
-k, --keep Keep (don't delete) input files during compression or decompression.
-L, --license This option prints gzip license.
-l, --list This option displays information about the file's compressed and uncompressed size, ratio, uncompressed name. With the -v
option, it also displays the compression method, CRC, date and time embedded in the file.
-N, --name This option causes the stored filename in the input file to be used as the output file.
-n, --no-name This option stops the filename and timestamp from being stored in the output file.
-q, --quiet With this option, no warnings or errors are printed.
-r, --recursive This option is used to gzip the files in a directory tree individually, using the fts(3) library.
-S suffix, --suffix suffix
This option changes the default suffix from .gz to suffix.
-t, --test This option will test compressed files for integrity.
-V, --version This option prints the version of the gzip program.
-v, --verbose This option turns on verbose mode, which prints the compression ratio for each file compressed.
ENVIRONMENT
If the environment variable GZIP is set, it is parsed as a white-space separated list of options handled before any options on the command
line. Options on the command line will override anything in GZIP.
SEE ALSO bzip2(1), compress(1), xz(1), fts(3), zlib(3), compat(5)HISTORY
The gzip program was originally written by Jean-loup Gailly, licensed under the GNU Public Licence. Matthew R. Green wrote a simple front
end for NetBSD 1.3 distribution media, based on the freely re-distributable zlib library. It was enhanced to be mostly feature-compatible
with the original GNU gzip program for NetBSD 2.0.
This implementation of gzip was ported based on the NetBSD gzip, and first appeared in FreeBSD 7.0.
AUTHORS
This implementation of gzip was written by Matthew R. Green <mrg@eterna.com.au> with unpack support written by Xin LI <delphij@FreeBSD.org>.
BUGS
According to RFC 1952, the recorded file size is stored in a 32-bit integer, therefore, it can not represent files larger than 4GB. This
limitation also applies to -l option of gzip utility.
BSD October 9, 2011 BSD