Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Faster command to remove headers for files in a directory
Top Forums Shell Programming and Scripting Faster command to remove headers for files in a directory Post 302730415 by Yoda on Monday 12th of November 2012 08:31:39 PM
Old 11-12-2012
Jim, do you mean file caching helped sed because of the sequence of execution I chose? If yes, I tried the other way and still sed took less time to complete this particular task.

Code:
# time sed '1d' infile > out

real    0m3.41s
user    0m1.22s
sys     0m1.62s

Code:
# time awk 'FNR>1' infile > out

real    0m5.60s
user    0m2.20s
sys     0m3.21s

Last edited by Yoda; 11-12-2012 at 09:38 PM.. Reason: Code Added
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

help:how to remove headers in output file

Hi I am running a script (which compares two directory contents) for which I am getting an output of 70 pages in which few pages are blank so I was able to delete those blank lines. But I also want to delete the headers present for each page. can any one help me by providing the code... (1 Reply)
Discussion started by: raj_thota
1 Replies

2. Shell Programming and Scripting

Which one is faster to remove control m characters?

I have a file with millions of records...Before I experiment, I would like to know which one is faster. Both the commands work absolutely fine on a smaller set of records. Please advice. sed 's/^M//g' ${INPUT_FILE} > tmp.txt mv tmp.txt ${INPUT_FILE} tr -d "\15" < ${INPUT_FILE} > ... (11 Replies)
Discussion started by: madhunk
11 Replies

3. Shell Programming and Scripting

Remove Headers throughout a data file

I have a data file with over 500,000 records/lines that has the header throughout the file. SEQ_ID Name Start_Date Ins_date Add1 Add2 1 Harris 04/02/08 03/02/08 333 Main Suite 101 2 Smith 02/03/08 01/23/08 287 Jenkins SEQ_ID Name ... (3 Replies)
Discussion started by: psmall
3 Replies

4. UNIX for Dummies Questions & Answers

Remove certain headers using mailx or sendmail

Hello, So i want to send mails in any way from a solaris 5.8 system, perhaps using mailx or sendmail. My purpose is to stay clear of systems name in head data. So i want to strip at least the "Message-Id" and the "Recieved" headers of the mail. Yet this seems to be a bit of a problem. Now i... (2 Replies)
Discussion started by: congo
2 Replies

5. Shell Programming and Scripting

Remove text between headers while leaving headers intact

Hi, I'm trying to strip all lines between two headers in a file: ### BEGIN ### Text to remove, contains all kinds of characters ... Antispyware-Downloadserver.com (Germany)=http://www.antispyware-downloadserver.c om/updates/ Antispyware-Downloadserver.com #2... (3 Replies)
Discussion started by: Trones
3 Replies

6. Shell Programming and Scripting

Merging of files with different headers to make combined headers file

Hi , I have a typical situation. I have 4 files and with different headers (number of headers is varible ). I need to make such a merged file which will have headers combined from all files (comman coluns should appear once only). For example - File 1 H1|H2|H3|H4 11|12|13|14 21|22|23|23... (1 Reply)
Discussion started by: marut_ashu
1 Replies

7. 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

8. UNIX for Dummies Questions & Answers

Using sed command to remove multiple instances of repeating headers in one file?

Hi, I have catenated multiple output files (from a monte carlo run) into one big output file. Each individual file has it's own two line header. So when I catenate, there are multiple two line headers (of the same wording) within the big file. How do I use the sed command to search for the... (1 Reply)
Discussion started by: rebazon
1 Replies

9. Shell Programming and Scripting

Remove headers thar dont match

Good evening I need your help please, im new at Unix and i wanted to remove the first 5 headers for 100000 records files and then create a control file .ctl that contains the number of records and all seem to work out but when i tested at production it didnt wotk. Here is the code: #!... (6 Replies)
Discussion started by: alexcol
6 Replies

10. Shell Programming and Scripting

Remove white space and duplicate headers

I have a file called "dsout" with empty rows and duplicate headers. DATE TIME TOTAL_GB USED_GB %USED --------- -------- ---------- ---------- ---------- 03/05/013 12:34 PM 3151.24316 2331.56653 73.988785 ... (3 Replies)
Discussion started by: Daniel Gate
3 Replies

LEARN ABOUT MOJAVE

locale::codes::langfam

Locale::Codes::LangFam(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangFam(3pm)

NAME

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

SYNOPSIS

	  use Locale::Codes::LangFam;

	  $lext = code2langfam('apa');		       # $lext gets 'Apache languages'
	  $code = langfam2code('Apache languages');    # $code gets 'apa'

	  @codes   = all_langfam_codes();
	  @names   = all_langfam_names();

DESCRIPTION

       The "Locale::Codes::LangFam" module provides access to standard codes used for identifying language families, such as those as defined in
       ISO 639-5.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 639-5
       language family codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language families. 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 = code2langfam('apa','alpha');
	  $lext = code2langfam('apa',LOCALE_LANGFAM_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from ISO 639-5 such as 'apa' for Apache languages.

	   This is the default code set.

ROUTINES

       code2langfam ( CODE [,CODESET] )
       langfam2code ( NAME [,CODESET] )
       langfam_code2code ( CODE ,CODESET ,CODESET2 )
       all_langfam_codes ( [CODESET] )
       all_langfam_names ( [CODESET] )
       Locale::Codes::LangFam::rename_langfam  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangFam::add_langfam  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangFam::delete_langfam  ( CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangFam::delete_langfam_alias  ( NAME )
       Locale::Codes::LangFam::rename_langfam_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::delete_langfam_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.loc.gov/standards/iso639-5/id.php
	   ISO 639-5 .

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 v5.18.2							    2013-11-04					       Locale::Codes::LangFam(3pm)
All times are GMT -4. The time now is 10:33 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy