Speeding up a Shell Script (find, grep and a for loop) Post: 302223668

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

grep'ing and sed'ing chunks in bash... need help on speeding up a log parser.

I have a file that is 20 - 80+ MB in size that is a certain type of log file. It logs one of our processes and this process is multi-threaded. Therefore the log file is kind of a mess. Here's an example: The logfile looks like: "DATE TIME - THREAD ID - Details", and a new file is created...

2. Shell Programming and Scripting

Bash script (using find and grep)

I'm trying to make a simple search script but cannot get it right. The script should search for keywords inside files. Then return the file paths in a variable. (Each file path separated with \n). #!/bin/bash SEARCHQUERY="searchword1 searchword2 searchword3"; for WORD in $SEARCHQUERY do ...

3. Shell Programming and Scripting

Shell script / Grep / Awk to variable and Loop

Hi, I have a text file with data in that I wish to extract, assign to a variable and process through a loop. Kind of the process that I am after: 1: Grep the text file for the values. Currently using: cat /root/test.txt | grep TESTING= | awk -F"=" '{ a = $2 } {print a}' | sort -u ...

4. UNIX for Dummies Questions & Answers

Speeding/Optimizing GREP search on CSV files

Hi all, I have problem with searching hundreds of CSV files, the problem is that search is lasting too long (over 5min). Csv files are "," delimited, and have 30 fields each line, but I always grep same 4 fields - so is there a way to grep just those 4 fields to speed-up search. Example:...

5. Shell Programming and Scripting

Speeding up search and replace in a for loop

Hello, I am using sed in a for loop to replace text in a 100MB file. I have about 55,000 entries to convert in a csv file with two entries per line. The following script works to search file.txt for the first field from conversion.csv and then replace it with the second field. While it works fine,...

6. Shell Programming and Scripting

Help speeding up script

This is my first experience writing unix script. I've created the following script. It does what I want it to do, but I need it to be a lot faster. Is there any way to speed it up? cat 'Tax_Provision_Sample.dat' | sort | while read p; do fn=`echo $p|cut -d~ -f2,4,3,8,9`; echo $p >> "$fn.txt";...

7. Shell Programming and Scripting

How to use grep in a loop using a bash script?

Dear all, Please help with the following. I have a file, let's call it data.txt, that has 3 columns and approx 700,000 lines, and looks like this: rs1234 A C rs1236 T G rs2345 G T Please use code tags as required by forum rules! I have a second file, called reference.txt,...

8. Shell Programming and Scripting

Speeding up shell script with grep

HI Guys hoping some one can help I have two files on both containing uk phone numbers master is a file which has been collated over a few years ad currently contains around 4 million numbers new is a file which also contains 4 million number i need to split new nto two separate files...

9. Shell Programming and Scripting

Help 'speeding' up this 'parsing' script - taking 24+ hours to run

Hi, I've written a ksh script that read a file and parse/filter/format each line. The script runs as expected but it runs for 24+ hours for a file that has 2million lines. And sometimes, the input file has 10million lines which means it can be running for more than 2 days and still not finish....

10. Shell Programming and Scripting

Help with speeding up my working script to take less time - how to use more CPU usage for a script

Hello experts, we have input files with 700K lines each (one generated for every hour). and we need to convert them as below and move them to another directory once. Sample INPUT:- # cat test1 1559205600000,8474,NormalizedPortInfo,PctDiscards,0.0,Interface,BG-CTA-AX1.test.com,Vl111...

LEARN ABOUT LINUX

shtool-path

SHTOOL-PATH.TMP(1)					      GNU Portable Shell Tool						SHTOOL-PATH.TMP(1)

NAME

       shtool-path - GNU shtool command dealing with shell path variables

SYNOPSIS

       shtool path [-s|--suppress] [-r|--reverse] [-d|--dirname] [-b|--basename] [-m|--magic] [-p|--path path] str [str ...]

DESCRIPTION

       This command deals with shell $PATH variables. It can find a program through one or more filenames given by one or more str arguments.  It
       prints the absolute filesystem path to the program displayed on "stdout" plus an exit code of 0 if it was really found.

OPTIONS

       The following command line options are available.

       -s, --suppress
	   Supress output. Useful to only test whether a program exists with the help of the return code.

       -r, --reverse
	   Transform a forward path to a subdirectory into a reverse path.

       -d, --dirname
	   Output the directory name of str.

       -b, --basename
	   Output the base name of str.

       -m, --magic
	   Enable advanced magic search for ""perl"" and ""cpp"".

       -p, --path path
	   Search in path. Default is to search in $PATH.

EXAMPLE

	#   shell script
	awk=`shtool path -p "${PATH}:." gawk nawk awk`
	perl=`shtool path -m perl`
	cpp=`shtool path -m cpp`
	revpath=`shtool path -r path/to/subdir`

HISTORY

       The GNU shtool path command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 1998 for Apache. It was later taken
       over into GNU shtool.

SEE ALSO

       shtool(1), which(1).

18-Jul-2008							   shtool 2.0.8 						SHTOOL-PATH.TMP(1)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

grep'ing and sed'ing chunks in bash... need help on speeding up a log parser.

Discussion started by: elinenbe

2. Shell Programming and Scripting

Bash script (using find and grep)

Discussion started by: limmer

3. Shell Programming and Scripting

Shell script / Grep / Awk to variable and Loop

Discussion started by: Spoonless

4. UNIX for Dummies Questions & Answers

Speeding/Optimizing GREP search on CSV files

Discussion started by: Whit3H0rse