Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: awk search and replace field
Top Forums Shell Programming and Scripting awk search and replace field Post 302443604 by bluejayek on Monday 9th of August 2010 01:38:02 PM
Old 08-09-2010
awk search and replace field
I am writing a c++ program that has many calls of pow(input,2). I now realize that this is slowing down the program and these all should be input * input for greater speed.

There should be a simple way of doing this replacement throughout my file with awk, but I am not very familiar with awk. Can anyone help me out?

To be clear, I want

Code:
pow(input,2)

replaced with
Code:
input * input

throughout the entire file. What I detonated as input varies greatly through all of my pow calls.

I know

Code:
awk '{gsub(/foo/,"bar");print}'

Will do search and replace but I'm not entirely sure how I would save the input string to replace it afterwards.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Perl - search and replace a particular field

Hi, I have a file having around 30 records. Each record has 5 fields delimited by PIPE. Few records in the file having Junk characters in the field2 and field4. I found the junk charcter and I tested it and replace the junk with space with the command below perl -i -p -e "s/\x00/ /g"... (1 Reply)
Discussion started by: ramkrix
1 Replies

2. Shell Programming and Scripting

Awk Search text string in field, not all in field.

Hello, I am using awk to match text in a tab separated field and am able to do so when matching the exact word. My problem is that I would like to match any sequence of text in the tab-separated field without having to match it all. Any help will be appreciated. Please see the code below. awk... (3 Replies)
Discussion started by: rocket_dog
3 Replies

3. Shell Programming and Scripting

Search duplicate field and replace one of them with new value

Dear All, I have file with 4 columns: 1 AA 0 21 2 BB 0 31 3 AA 0 21 4 CC 0 41 I would like to find the duplicate record based on column 2 and replace the 4th column of the duplicate by a new value. So, the output will be: 1 AA 0 21 2 BB 0 31 3 AA 0 -21 4 CC 0 41 Any suggestions... (3 Replies)
Discussion started by: ezhil01
3 Replies

4. Shell Programming and Scripting

Search a string,get line and replace with second field

Hi, I need to search for source path in file2 , as per file1 and if found get the next line and take the field value and put it in URL value of file1. In file1, NF is not same for all the lines. file1: <type source="/home/USER/Desktop" Dest="/home/USER/DIR1/Desktop" URL="ssh/path"/> <type... (8 Replies)
Discussion started by: greet_sed
8 Replies

5. Shell Programming and Scripting

Search and replace field?

I have 2 files A.txt and B.txt A.txt 3 fields and separate by a comma some,thing,florida any1,thing1,california some2,thing2,dallas just,fun,kansas B.txt has 8 fields and separate by a comma what,ever,florida-state,,,,,, some,one,dallas_state,,,,,, You will see 3rd fields are the... (5 Replies)
Discussion started by: sabercats
5 Replies

6. Shell Programming and Scripting

awk search/replace specific field, using variables for regexp & subsitution then overwrite file

Hello, I'm trying the solve the following problem. I have a file which I intend to use as a csv called master.csv The columns are separated by commas. I want to change the text on a specific row in either column 3,4,5 or 6 from xxx to yyy depending upon if column 1 matches a specified pattern.... (3 Replies)
Discussion started by: cyphex
3 Replies

7. Shell Programming and Scripting

awk search and replace in a targeted field instead of $0

Hi I would like to apply this gawk command: gawk '{$0=gensub(/\y+\y/,"","g"); print}' file not to the whole $0 but just to the part of $0 that is between: (a number)"> and </mrk> Is it possible? thanks for your help. (4 Replies)
Discussion started by: louisJ
4 Replies

8. UNIX for Dummies Questions & Answers

Shell script for search and replace by field

Hi, I have an input file with below data and rules file to apply search and replace by each field in the input based on exact value or pattern. Could you please help me with unix script to read input file and rules file and then create the output and reject files based on the rules file. Input... (13 Replies)
Discussion started by: chandrath
13 Replies

9. Shell Programming and Scripting

Search for a value and replace other field in the same set

Hello friends, I have huge file with many sets where each "set" has few lines and each set always begins with "Set" in Sq brackets as shown above. # cat file1 (2 Replies)
Discussion started by: magnus29
2 Replies

10. UNIX for Dummies Questions & Answers

Search and replace the last field

Hi All, Seeking for your assistance on how to search and replace the last field/column. please see sample below: inputfile1.csv ="8923523434",="543623534"="afd23535623",="100"="200" ="8923523431",="543623536"="afd23535626",="101"="201"... (3 Replies)
Discussion started by: poginiks
3 Replies

LEARN ABOUT CENTOS

locale::codes::langext

Locale::Codes::LangExt(3)				User Contributed Perl Documentation				 Locale::Codes::LangExt(3)

NAME

       Locale::Codes::LangExt - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangExt;

	  $lext = code2langext('acm');		       # $lext gets 'Mesopotamian Arabic'
	  $code = langext2code('Mesopotamian Arabic'); # $code gets 'acm'

	  @codes   = all_langext_codes();
	  @names   = all_langext_names();

DESCRIPTION

       The "Locale::Codes::LangExt" module provides access to standard codes used for identifying language extensions, such as those as defined in
       the IANA language registry.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language
       registry codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language extensions. A code set may be specified using either a name, or
       a constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langext('acm','alpha');
	  $lext = code2langext('acm',LOCALE_LANGEXT_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from the IANA language registry, such as 'acm' for Mesopotamian Arabic.

	   This is the default code set.

ROUTINES

       code2langext ( CODE [,CODESET] )
       langext2code ( NAME [,CODESET] )
       langext_code2code ( CODE ,CODESET ,CODESET2 )
       all_langext_codes ( [CODESET] )
       all_langext_names ( [CODESET] )
       Locale::Codes::LangExt::rename_langext  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangExt::add_langext  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangExt::delete_langext  ( CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangExt::delete_langext_alias  ( NAME )
       Locale::Codes::LangExt::rename_langext_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::delete_langext_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2013 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.3							    2013-02-27						 Locale::Codes::LangExt(3)
All times are GMT -4. The time now is 08:16 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy