Sponsored Content
Full Discussion: how to choose random columns
Top Forums Shell Programming and Scripting how to choose random columns Post 302516556 by ahamed101 on Sunday 24th of April 2011 06:12:20 AM
Old 04-24-2011
Actually it is not very clear

lets say you give n=100, you want to extract first 100 columns from all the rows.

regards,
Ahamed

---------- Post updated at 02:12 AM ---------- Previous update was at 02:06 AM ----------

To extract columns from m to n where n>m

Code:
#awk '{gsub("\t"," ",$0);print}' file | cut -d" " -fm-n
#eg:
awk '{gsub("\t"," ",$0);print}' file | cut -d" " -f3-5

#eg to extract first 400 columns
awk '{gsub("\t"," ",$0);print}' file | cut -d" " -f1-400

regards,
Ahamed
This User Gave Thanks to ahamed101 For This Post:
 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

choose random text between constant string.. using awk?

Hallo I have maybe a little bit advanced request.... I need to choose one random part betwen %.... so i have this.. % text1 text1 text1 text1 text1 text1 text1 text1 text1 % text2 text2 text2 text2 text2 % text3 text3 text3 tetx3 % this choose text between % awk ' /%/... (8 Replies)
Discussion started by: sandwich
8 Replies

2. Shell Programming and Scripting

choose y or n

Hi, I have written a choice based shell script some thing like this: if (y) execute code .... fi else if(n) terminating the problem with the above scripting is it will work as far as the options are y or n. but i want to reiterate the same code when the user inputs something else... (1 Reply)
Discussion started by: sunrexstar
1 Replies

3. Ubuntu

expect script for random password and random commands

Hi I am new to expect. Please if any one can help on my issue its really appreciable. here is my issue: I want expect script for random passwords and random commands generation. please can anyone help me? Many Thanks in advance (0 Replies)
Discussion started by: vanid
0 Replies

4. What is on Your Mind?

Which Tablet to Choose?

Currently in the process of looking for a tablet. Which one is best? Thanks Benjamin Mauerberger (9 Replies)
Discussion started by: hlinks12
9 Replies

5. Shell Programming and Scripting

choosing random columns from a file

Hello, I want to choose random columns from big file. for example: My file contain around 21000 columns and I want to randomly extract 4000 columns from this file. Anybody has a solution (may be one liner or a function in perl or awk) for this? Thanks, R (2 Replies)
Discussion started by: ryan9011
2 Replies

6. Shell Programming and Scripting

Need to generate a file with random data. /dev/[u]random doesn't exist.

Need to use dd to generate a large file from a sample file of random data. This is because I don't have /dev/urandom. I create a named pipe then: dd if=mynamed.fifo do=myfile.fifo bs=1024 count=1024 but when I cat a file to the fifo that's 1024 random bytes: cat randomfile.txt >... (7 Replies)
Discussion started by: Devyn
7 Replies

7. Shell Programming and Scripting

Selecting random columns from large dataset in UNIX

Dear folks I have a large data set which contains 400K columns. I decide to select 50K determined columns from the whole 400K columns. Is there any command in unix which could do this process for me? I need to also mention that I store all of the columns id in one file which may help to select... (5 Replies)
Discussion started by: sajmar
5 Replies

8. Shell Programming and Scripting

Script that will random choose an IP address

Hi, I need to write a bash script that will random choose and login into these below ip addresses. 192.168.116.130 192.168.116.131 192.168.116.132 192.168.116.133 I'm new into scripting and I need to enhance my logic. Below is what i did ... (4 Replies)
Discussion started by: Milon
4 Replies

9. UNIX for Beginners Questions & Answers

Which Product to Choose?

Okay, I have an Asus A8NSLI board with an Athlon 64 and I dunno, maybe 8gig Ram and Windows has crashed for the last time so I've finally had enough and I'll make it a Unix machine. I have a new 1Tera drive and I'm all set to go. Which brand of Unix/Linux can you advise me to go for? The... (3 Replies)
Discussion started by: abrogard
3 Replies
NUMSUM(1)						User Contributed Perl Documentation						 NUMSUM(1)

NAME
numsum - numsum program file SYNOPSIS
numsum [-iIcdhrsvxy] <FILE> | numsum [-iIcdhrsvxy] (Input on STDIN from pipeline.) numsum [-iIcdhrsvxy] (Input on STDIN. Use Ctrl-D to stop.) DESCRIPTION
numsum will take all the numbers on stdin and return the sum of those numbers. Currently it only processes the first number on each line. Besides positive numbers, it also handles negative numbers and numbers with decimals. OPTIONS
-i Only return the integer portion of the final sum. -I Only return the decimal portion of the final sum. -c Print out the sum of each column. -r Print out the sum of each row. -x <n> Specify a comma seperated list of columns to print. -y <n> Specify a comma seperated list of rows to print. -s <string> Specify a string to use as a seperator for columns. This defaults to be consecutive whitespace (s+). -h Help: You're looking at it. -V Increase verbosity. -d Debug mode. For developers -q Quiet mode, don't print any warnings. EXAMPLES
Simply add up the numbers in a file. $ numsum numbers.txt 4315 Enter your own numbers on STDIN. The last number is the answer. $ numsum 4 21 98 100 223 Use it in a command pipeline. $ ls -1s | grep .mp3 | numsum -c -x 5 72288 Add up the total byte count in a http log file. $ cat access_log | awk {'print $10'} numsum or numsum -c -x 10 access_log Add up the columns of numbers of a file. $ cat columns 1 6 11 16 21 2 7 12 17 22 3 8 13 18 23 4 9 14 19 24 5 10 15 20 25 $ numsum -c columns 15 40 65 90 115 Add up the 1st, 2nd and 5th columns only. $ numsum -c -x 1,2,5 columns 15 40 115 Add up the rows of numbers of a file. $ numsum -r columns 55 60 65 70 75 Add up the 2nd and 4th rows. $ numsum -r -y 2,4 columns 60 70 SEE ALSO
numaverage(1), numbound(1), numinterval(1), numnormalize(1), numgrep(1), numprocess(1), numrandom(1), numrange(1), numround(1) COPYRIGHT
numsum is part of the num-utils package, which is copyrighted by Suso Banderas and released under the GPL license. Please read the COPYING and LICENSE files that came with the num-utils package Developers can read the GOALS file and contact me about providing submitions or help for the project. MORE INFO
More info on numsum can be found at: http://suso.suso.org/programs/num-utils/ perl v5.10.1 2009-10-31 NUMSUM(1)
All times are GMT -4. The time now is 06:52 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy