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Full Discussion: sum of a column and selecting lines with value above threshold
Top Forums Shell Programming and Scripting sum of a column and selecting lines with value above threshold Post 302577068 by balajesuri on Monday 28th of November 2011 06:19:54 AM
Old 11-28-2011
Code:
#! /usr/bin/perl -w
use strict;

my ($line, $sum, $crtn_value, $ratio) = (0, 0, 1e-4, 0);
my (@x);

open INPUT, "< input.txt";
for $line (<INPUT>) {
    @x = split /\s+/, $line;
    $sum = $sum + $x[2];
}
close INPUT;

open INPUT, "< input.txt";
for $line (<INPUT>) {
    @x = split /\s+/, $line;
    $ratio = $x[2] / $sum;
    ($ratio > $crtn_value) && print "$line";
}
close INPUT;

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LEARN ABOUT PLAN9

pr

PR(1)							      General Commands Manual							     PR(1)

NAME

       pr - print file

SYNOPSIS

       pr [ option ...	] [ file ...  ]

DESCRIPTION

       Pr  produces  a printed listing of one or more files on its standard output.  The output is separated into pages headed by a date, the name
       of the file or a specified header, and the page number.	With no file arguments, pr prints its standard input.

       Options apply to all following files but may be reset between files:

       -n     Produce n-column output.

       +n     Begin printing with page n.

       -b     Balance columns on last page, in case of multi-column output.

       -d     Double space.

       -en    Set the tab stops for input text every n spaces.

       -h     Take the next argument as a page header (file by default).

       -in    Replace sequences of blanks in the output by tabs, using tab stops set every n spaces.

       -f     Use formfeeds to separate pages.

       -ln    Take the length of the page to be n lines instead of the default 66.

       -m     Print all files simultaneously, each in one column.

       -n     Number the lines of each file.

       -on    Offset the left margin n character positions.

       -sc    Separate columns by the single character c instead of aligning them with white space.  A missing c is taken to be a tab.

       -t     Do not print the 5-line header or the 5-line trailer normally supplied for each page.

       -wn    For multi-column output, take the width of the page to be n characters instead of the default 72.

SOURCE

       /sys/src/cmd/pr.c

SEE ALSO

       cat(1), lp(1)

																	     PR(1)
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