Sponsored Content
Full Discussion: Bash script too slow
Top Forums Shell Programming and Scripting Bash script too slow Post 302390876 by tigta09 on Friday 29th of January 2010 09:52:10 AM
Old 01-29-2010
Bash script too slow

I have a bash script that will take approx. 130 days to complete. I am trying to grep a list of 1,144 user ID's out of 41 (1 GB each) files. The 41 files were originally one 41 G file, but that was horrendously too slow.Smilie
This is my current file:
Code:
#!/bin/bash
      for i in `cat WashFD.txt`  # 1,144 files
          do
           for b in `cat xfiles` # 41 "x??" files
            do
          echo "looking for " $i "in " $b
          cat $b | grep -i $i   >> SEID.searches
      done
    done

Currently, I am processing one of the 41 files every 4 minutes. 4 x 41 = 164 min.
164 / 60 (min/hour) = 2.73 hours per user_id. I have 1,144 user_id's multiplied by 2.73 = 3123.12 hours. 3123.12 / 24 (hours in a day) = 130.13 days.

As you can see, that is way too long to process this task. I don't know PERL but I've heard its faster. If anyone has any suggestions please let me know.Smilie

Last edited by vbe; 01-29-2010 at 10:54 AM.. Reason: code tags please
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

My script runs too slow :-(...

Hello experts, I have a series issue in script that result with bad peformence and I wonder if you can assist me. For example I have two files: File-New, size 15Mb. File-Old, size 1Mb. File-New content: a b c k File-Old content: d f a b (0 Replies)
Discussion started by: roybe
0 Replies

2. Shell Programming and Scripting

script to add numbers is slow

Hi, I am running a BASH shell with the following script. The script works and gives me correct output but is very slow with large files. The more rows and columns (width and height) the slower as you can probably see. How can I do what I want more efficiently? Any ideas welcome. It has been... (10 Replies)
Discussion started by: macsurveyr
10 Replies

3. Shell Programming and Scripting

Slow Perl script: how to speed up?

I had written a perl script to compare two files: new and master and get the output of the first file i.e. the first file: words that are not in the master file STRUCTURE OF THE TWO FILES The first file is a series of names ramesh sushil jonga sudesh lugdi whereas the second file (could be... (4 Replies)
Discussion started by: gimley
4 Replies

4. UNIX for Dummies Questions & Answers

Help with slow KSH script

My script builds a lot of these array lists, then compares their sizes which solves my problem, but runs very slow. :( set -A comboSorted -- $( for x in ${IDs} do nawk -v s=$x ' BEGIN { testPattern="^" s "$" } { if ( $2 ~ testPattern ) { getline;getline; if ($1 == "IMAGE_SIZE") print... (1 Reply)
Discussion started by: nerdcurious
1 Replies

5. Shell Programming and Scripting

Slow Script Execution.

Basically my requirement is to know the total number of free anonymous ports. anonymous port range is 32768- 65535. i wrote a script for that ********************************************** for i in {32768..65535} do netstat -an | grep $i > /dev/null if ... (21 Replies)
Discussion started by: mohtashims
21 Replies

6. Shell Programming and Scripting

Slow down output from dhclient-script to screen

Hi I know the basic about script and sleep processes. However this is more tricky: I would like to run sh -x /sbin/dhclient-script and slow down the output of the script as a whole. How would you do it? I would like to delay output on the screen with 1 second for every line for the output... (3 Replies)
Discussion started by: medium_linux
3 Replies

7. Shell Programming and Scripting

Shell script reading file slow

I have shell program as below #!/bin/sh echo ======= LogManageri start ========== #This directory is getting the raw data from remote server Raw_data=/opt/ftplogs # This directory is ready for process the data Processing_dir=/opt/processing_dir # This directory is prcoessed files and... (4 Replies)
Discussion started by: Chenchireddy
4 Replies

8. Shell Programming and Scripting

BASH Slow Under Cron Only!

I've got a BASH script that runs much faster from the command line than when invoked under CRON. Ideas? Priority? IO? (1 Reply)
Discussion started by: gmark99
1 Replies

9. Shell Programming and Scripting

Bin/bash - xmessage very slow

Hello, I am showing the start of my script. I am finding that 'xmessage' is taking about 12-15 seconds to show. This in a terminal is very quick '/opt/vc/bin/vcgencmd get_camera'. Is there any way to get 'camera not detected' to show faster. Regards #!/bin/bash s=$(/opt/vc/bin/vcgencmd... (4 Replies)
Discussion started by: mad-hatter
4 Replies

10. Shell Programming and Scripting

How to block first bash script until second bash script script launches web server/site?

I'm new to utilities like socat and netcat and I'm not clear if they will do what I need. I have a "compileDeployStartWebServer.sh" script and a "StartBrowser.sh" script that are started by emacs/elisp at the same time in two different processes. I'm using Cygwin bash on Windows 10. My... (3 Replies)
Discussion started by: siegfried
3 Replies
httpindex(1)						      General Commands Manual						      httpindex(1)

NAME
httpindex - HTTP front-end for SWISH++ indexer SYNOPSIS
wget [ options ] URL... 2>&1 | httpindex [ options ] DESCRIPTION
httpindex is a front-end for index++(1) to index files copied from remote servers using wget(1). The files (in a copy of the remote direc- tory structure) can be kept, deleted, or replaced with their descriptions after indexing. OPTIONS
wget Options The wget(1) options that are required are: -A, -nv, -r, and -x; the ones that are highly recommended are: -l, -nh, -t, and -w. (See the EXAMPLE.) httpindex Options httpindex accepts the same short options as index++(1) except for -H, -I, -l, -r, -S, and -V. The following options are unique to httpindex: -d Replace the text of local copies of retrieved files with their descriptions after they have been indexed. This is useful to display file descriptions in search results without having to have complete copies of the remote files thus saving filesystem space. (See the extract_description() function in WWW(3) for details about how descriptions are extracted.) -D Delete the local copies of retrieved files after they have been indexed. This prevents your local filesystem from filling up with copies of remote files. EXAMPLE
To index all HTML and text files on a remote web server keeping descriptions locally: wget -A html,txt -linf -t2 -rxnv -nh -w2 http://www.foo.com 2>&1 | httpindex -d -e'html:*.html,text:*.txt' Note that you need to redirect wget(1)'s output from standard error to standard output in order to pipe it to httpindex. EXIT STATUS
Exits with a value of zero only if indexing completed sucessfully; non-zero otherwise. CAVEATS
In addition to those for index++(1), httpindex does not correctly handle the use of multiple -e, -E, -m, or -M options (because the Perl script uses the standard GetOpt::Std package for processing command-line options that doesn't). The last of any of those options ``wins.'' The work-around is to use multiple values for those options seperated by commas to a single one of those options. For example, if you want to do: httpindex -e'html:*.html' -e'text:*.txt' do this instead: httpindex -e'html:*.html,text:*.txt' SEE ALSO
index++(1), wget(1), WWW(3) AUTHOR
Paul J. Lucas <pauljlucas@mac.com> SWISH++ August 2, 2005 httpindex(1)
All times are GMT -4. The time now is 08:25 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy