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Top Forums Shell Programming and Scripting Pull specific lines from long file based on formula Post 302509357 by jim mcnamara on Wednesday 30th of March 2011 03:11:22 PM
Old 03-30-2011
This reads the file 100 times. If the file has 10^8 lines that will take all day.
You can embed the loop into awk, which is not super fast, but is acceptable:
Code:
limit=101
a=0
b=1
awk -v lim=$limit '
     {   
     for(n=1; n<lim; n++) 
       { 
          if(NR==a+(b*n) )
            {print $0 }
       } '  a=$a b=$b  inputfile > outputfile

 

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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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