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Top Forums Shell Programming and Scripting How to cut some data from big file Post 302344212 by almanto on Saturday 15th of August 2009 06:10:20 AM
Old 08-15-2009
Quote:
Originally Posted by danmero
You can try awk:
Code:
# time awk 'NR >= 46467831 && NR <= 50022172' big_file > new_big_file
 
real    0m46.536s
user    0m43.761s
sys     0m1.487s
 
# wc -l < new_big_file
 3554342

Thank you danmero.

So faster
My file has size 18 GB
Code:
time nawk 'NR >= 77930597 && NR <= 86671221' bigfile > newfile
real    2m41.942s
user    2m10.469s
sys     0m18.560s

but this command rather consume cpe 25%
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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