Sponsored Content
Top Forums Shell Programming and Scripting How to make awk command faster for large amount of data? Post 303024264 by Don Cragun on Thursday 4th of October 2018 09:11:43 PM
Old 10-04-2018
Quote:
Originally Posted by disedorgue
Hi, here a perl script that output first and last line, maybe most faster but i'm not sure...

... ... ...

Regards.
It might, or might not, be faster depending on what hardware you're using, what operating system you're using, what version of perl you're using, and what other tools you're using as a comparison. But, note that even though this is only printing the first and last lines of the compressed file, it can't avoid reading the entire compressed file and uncompressing all of the compressed data to be able to determine the contents of the last line in the file. (Decompression can't start at random places in the file; it must start at the beginning and progress byte by byte from there.)
This User Gave Thanks to Don Cragun For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

awk help to make my work faster

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)
Discussion started by: kumar_amit
11 Replies

2. Programming

Read/Write a fairly large amount of data to a file as fast as possible

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)
Discussion started by: emitrax
3 Replies

3. AIX

amount of memory allocated to large page

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)
Discussion started by: daveisme
1 Replies

4. Shell Programming and Scripting

How to tar large amount of files?

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)
Discussion started by: chriss_58
9 Replies

5. Emergency UNIX and Linux Support

Help to make awk script more efficient for large files

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)
Discussion started by: script_op2a
4 Replies

6. Shell Programming and Scripting

Running rename command on large files and make it faster

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)
Discussion started by: shoaibjameel123
6 Replies

7. Shell Programming and Scripting

Faster way to use this awk command

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)
Discussion started by: SkySmart
8 Replies

8. Shell Programming and Scripting

awk changes to make it faster

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)
Discussion started by: mirwasim
6 Replies

9. Shell Programming and Scripting

Perl : Large amount of data put into an array

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)
Discussion started by: sumguy
5 Replies

10. Shell Programming and Scripting

How to make awk command faster?

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
GZEXE(1)						      General Commands Manual							  GZEXE(1)

NAME
gzexe - compress executable files in place SYNOPSIS
gzexe [ name ... ] DESCRIPTION
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``gzexe /bin/cat'' it will create the following two files: -r-xr-xr-x 1 root bin 9644 Feb 11 11:16 /bin/cat -r-xr-xr-x 1 bin bin 24576 Nov 23 13:21 /bin/cat~ /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file. You can remove /bin/cat~ once you are sure that /bin/cat works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
gzip(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep). BUGS
gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. GZEXE(1)
All times are GMT -4. The time now is 04:33 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy