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Full Discussion: Get 20% of lines in File randomly
Top Forums Shell Programming and Scripting Get 20% of lines in File randomly Post 302719111 by Lem on Monday 22nd of October 2012 05:34:32 AM
Old 10-22-2012
Quote:
Originally Posted by chercheur857
My question please how can i eliminate 50 an 51 , i mean i'd like 25% of this list other than this two lines 50 and 51, and i'd like to specify it in the command like that
Code:
./program Myfile 10 50 51

Have you an idea please ?
Thank you so much for help Smilie
Code:
#!/bin/bash

inputfile="/tmp/buddyfile"
cp "$1" $inputfile
(( $# < 3 )) || {
        string="-${3}$"
        for ((a=4;a<=$#;a++)); do
                string+="\|-${!a}$"
        done
        sed -i "/$string/d" $inputfile; }

range=$(wc -l $inputfile | cut -d " " -f1)
(( $range > 32768 )) && exit              ### max number of lines for this script: 32768
percent=$2                                ### set this  as you like, [1-100]
(( 0 < $2 )) && (( $2 < 101 )) || exit
lim=$(( $range * $percent / 100 ))
for ((i=0;i<lim;i++)); do
        num=$(( $RANDOM % $range + 1 ));
        arr[$i]=$num;
        for ((j=0;j<i;j++)); do
                (( ${arr[$j]} == $num )) && {
                        let i--
                        break; }
        done
done

for linenum in "${arr[@]}"; do
        line=$(sed -n "$linenum p" $inputfile)
        ### your stuff here, for example: ###
        echo "$linenum"$'\t'"### $line"
done

exit 0

Changes are in bold. I didn't test it, but it should work.

Of course if 50, 51 and friends are true line numbers counting from 1 (first line) onwards, we can simplify the new part of the script.

Beware: if you have a file of 100 lines, and you exclude 40 lines, and you want 30% of the lines, you'll get 30% of the remaining 60 lines, so you'll get 18 lines. Is this right for you, or do you still want 30 lines among the 60 remaining lines?
--
Bye
Last edited by Lem; 10-22-2012 at 06:43 AM..
This User Gave Thanks to Lem For This Post:
chercheur857
 

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LEARN ABOUT DEBIAN

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.
	      Please notice this option isn't related to the terminal length as in a "80 culums terminal".

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do right to left (RTL) layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter and A4. Default is A4.

       Postscript points
	      Each postscript point equals to 1/72 of an inch. 36 points are 1/2 of an inch.

       --bottom-margin=bm
	      Set bottom margin. Default is 36 postscript points.

       --top-margin=tm
	      Set top margin. Default is 36 postscript points.

       --left-margin=lm
	      Set left margin. Default is 36 postscript points.

       --right-margin=rm
	      Set right margin. Default is 36 postscript points.

       --gutter-width=gw
	      Set gutter width. Default is 40 postscript points.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)
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