how to select a value randomly Post: 42393

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Read line from file randomly

I have data file with customer.dat, and this contains the customer names >cat customer.dat FirstName1 LastName1 FistName2 LastName1 FistName3 MiddleName3 LastName3 This file can contain areoun 100 customer names. Regards,

2. Shell Programming and Scripting

Script exits with $? not 0 randomly, how can I see what command failed?

Hi! I have this situation with 3 shellscripts. One is a "startscript" that simply calls other scripts. This one is scheduled with cron to run at regular intervals. That script runs what I'll refer to as Script 1. Script 1 in turn runs script 2 (import_catalogs_buyer.sh) Sometimes, seemingly...

3. UNIX for Dummies Questions & Answers

randomly renaming files

I have a directory of files that look like filename 001.ext, filename 002.ext, etc. I'd like to rename the files with unique random numbered names, so that the original filenames are stripped and the files are given a new, random number name. I'm not super new to UNIX, but I don't often use it for...

4. Shell Programming and Scripting

Cron job randomly once a day

I want to create a cron job randomly once a day for my site's registration. The responsible file for registrations is a config file and I need to change the contents twice on day (on and off) I know the way for random cron job for example */n * * * * /usr/local/bin/php...

5. Programming

Java application dying randomly

Hi, (First post, please be gental!) I have a java app that I am running on unix (centos) But it keeps dying randomly. The times seem random from anything between 3 hours and 3 days. I have a cronjob running to restart it when ever it dies but I would rather this happened less often. ...

6. Shell Programming and Scripting

randomly shuffle two text files the same way

What I have are two text files that I need to shuffle randomly, but I need the two files to be randomly shuffled the same way. I have heard of shuf but I do not know how to use it for two files. Maybe there is also an easy/simple awk command I do not know about that could handle this problem. ...

7. Shell Programming and Scripting

Get 20% of lines in File randomly

Hello, This is my code: nb_lignes=`wc -l $1 | cut -d " " -f1` for i in $(seq $nb_lignes) do m=`head $1 -n $i | tail -1` //command done Please how can i change it to get Get 20% of lines in File randomly to apply "command" on each line ? 20% or 40% or 60 % (it's a parameter) Thank you.

8. UNIX for Dummies Questions & Answers

How to randomly select lines from a text file

I have a text file with 1000 lines, I want to randomly select 200 lines from it and print them as output. How do I go about doing that? Thanks!

9. Shell Programming and Scripting

Randomly create time in UNIX

Hey, How can i create randomly create time N times. Suppose i want to create data for a particualr date 5 times... Mon Jan 19 11:42:50 Mon Jan 19 19:16:40 Mon Jan 19 12:12:33 Mon Jan 19 14:26:27 Mon Jan 19 12:29:53 Mon Jan 19 13:30:31 I want the script to create N times randome...

10. Shell Programming and Scripting

How to select lines randomly without replacement in UNIX?

Dear Folks I have one column of 15000 lines and want to select randomly 5000 of them in five different times without replacement. I am aware that command 'shuf' and 'sort -R' could select randomly those lines but I am not sure how could I avoid the replacement of selection line. Does anyone have...

LEARN ABOUT SUSE

update-bootloader

UPDATE-BOOTLOADER(1)					User Contributed Perl Documentation				      UPDATE-BOOTLOADER(1)

NAME

       update-bootloader - update/change bootloader configuration using
	   Bootloader::Tools perl module

SYNOPSIS

       update-bootloader [operation] [options]

       operation is one of --add, --remove or --refresh.

       valid options are --help, --man, --image <file>, --initrd <file>, --xen-kernel <file>, --xen, --default, --previous, --name <string>,
       --force, --force-default.

DESCRIPTION

       update-bootloader will let you modify your bootloader configuration using Bootloader::Tools perl module.

OPERATIONS

       --add   add an new image section.  Needs a call to --refresh to take effect.

       --remove
	       remove the specified image section.  Needs a call to --refresh to take effect.

       --refresh
	       activate the new config e.g. write boot loader to disk

PARAMETER

       --help  Print a brief help message and exits.

       --man   Prints the manual page and exits.

       --image file
	       specify path to kernel image

       --initrd file
	       specify path to initrd file

       --xen   specify that you what to add a xen and not a regular image section

       --xen-kernel file
	       specify that you what to add a xen section with a specific image.  Implies --xen option.

       --default
	       let the new section to be added be the default section if appropriate. Only allowed together with --add operation

       --previous
	       set some usuable defaults for image, initrd and name when

       --name string
	       specify the name of the section to be added/removed

       --force dont complain, just do the right thing

       --force-default
	       force the new section to be added to be the default section. Only allowed together with --add operation

perl v5.12.1							    2010-04-22						      UPDATE-BOOTLOADER(1)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Read line from file randomly

Discussion started by: McLan

2. Shell Programming and Scripting

Script exits with $? not 0 randomly, how can I see what command failed?

Discussion started by: trailsmoke

3. UNIX for Dummies Questions & Answers

randomly renaming files

Discussion started by: platz

4. Shell Programming and Scripting

Cron job randomly once a day

Discussion started by: lucker