Sponsored Content
Full Discussion: Edit a large file in place
Top Forums Shell Programming and Scripting Edit a large file in place Post 302134396 by ilan on Thursday 30th of August 2007 04:23:06 PM
Old 08-30-2007
Here is the initial move on your requirement:
>>1. Generate some random numbers of a fixed length.

i=00000000
echo $RANDOM$i | cut -c 1-8

the above serves to generate random numbers for more than 50 million records;again not sure how frequently a number repeats!!

not clear about the second requirement. be specific please...

-ilan
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

how to edit large files using vi

How to edit large file using vi where you can't increase /usr/var/tmp anymore? (3 Replies)
Discussion started by: nazri
3 Replies

2. Shell Programming and Scripting

Help to edit a large file

I am trying to edit a file that has 33k+ records. In this file I need to edit each record that has a 'Y' in the 107th position and change the 10 fields before the 'Y' to blanks. Not all records have a 'Y' in the 107th field. ex: ... (8 Replies)
Discussion started by: jxh461
8 Replies

3. Shell Programming and Scripting

how to edit large file in unix

hi All, Plz let me know how to edit a file with 2000000 records. each record contains with 40 field seperated by |. i want modify 455487 record, but i am uable to edit this large file using vi editor in unix. plz let me know how to modify this file. Thanks in advance. -Bali Reddy (3 Replies)
Discussion started by: balireddy_77
3 Replies

4. Shell Programming and Scripting

Scripting the process to edit a large file

Hi, I need to make a script to edit a file. File is a large file in below format Version: 2008120101 ;$INCLUDE ./abc/xyz/Delhi ;$INCLUDE ./abc/xyz/London $INCLUDE ./abc/xyz/New York First line in the file is version number which is in year,month,date and serial number format. Each... (5 Replies)
Discussion started by: makkar4u
5 Replies

5. Shell Programming and Scripting

sed edit in place -i issues

Hello, I am attempting to create a command that I can eventually put into a loop so I can edit 1file on many servers. I would like to edit the file in place with sed -i. If not I will take any suggestions on how to use a temp file. I need to remove a email address from the configuration file... (4 Replies)
Discussion started by: abacus
4 Replies

6. Solaris

What is the best way to copy data from place to another place?

Dear Gurus, I need you to advice or suggestion about the best solution to copy data around 200-300G from serverA(location A) to serverB(location B). Normally, I will share folder and then copy but it takes too long time(about 2 days). Do you have any suggestion or which way should be... (9 Replies)
Discussion started by: unitipon
9 Replies

7. Shell Programming and Scripting

Read from file specific place in file using inode

Hello, I am using tcsh on AIX. I would like to write a script that does the following: 1. given an inode, how do I find exactly the name of the file? I know I could do this using ls -i | grep <inode> but it returns: <inode> <filename>. I need some string manipulation or something to... (1 Reply)
Discussion started by: lastZenMaster
1 Replies

8. Shell Programming and Scripting

How to get awk to edit in place and join all lines in text file

Hi, I lack the utter fundamentals on how to craft an awk script. I have hundreds of text files that were mangled by .doc format so all the lines are broken up so I need to join all of the lines of text into a single line. Normally I use vim command "ggVGJ" to join all lines but with so many... (3 Replies)
Discussion started by: n00ti
3 Replies

9. Shell Programming and Scripting

How to edit a large file

Whenever I am trying to edit a file in unix with vi editor, I am getting the following error: <data> :Tmp file too large Is there any way that I can edit the file other than vi. Any help is really appreciated. Thanks (10 Replies)
Discussion started by: bobby1015
10 Replies

10. Shell Programming and Scripting

Search for a file in all directories and place the file in that directory

Hi All, Daily I am getting the updated file. I have to search for this file in all directories and sub directories. If the file existed in a particular directory then move this updated file to that particular directory. If the file is not existed in any of the directories then place this... (4 Replies)
Discussion started by: ROCK_PLSQL
4 Replies
RANDOM(3)						     Linux Programmer's Manual							 RANDOM(3)

NAME
random, srandom, initstate, setstate - random number generator. SYNOPSIS
#include <stdlib.h> long int random(void); void srandom(unsigned int seed); char *initstate(unsigned int seed, char *state, size_t n); char *setstate(char *state); DESCRIPTION
The random() function uses a non-linear additive feedback random number generator employing a default table of size 31 long integers to return successive pseudo-random numbers in the range from 0 to RAND_MAX. The period of this random number generator is very large, approx- imately 16*((2**31)-1). The srandom() function sets its argument as the seed for a new sequence of pseudo-random integers to be returned by random(). These sequences are repeatable by calling srandom() with the same seed value. If no seed value is provided, the random() function is automati- cally seeded with a value of 1. The initstate() function allows a state array state to be initialized for use by random(). The size of the state array n is used by init- state() to decide how sophisticated a random number generator it should use -- the larger the state array, the better the random numbers will be. seed is the seed for the initialization, which specifies a starting point for the random number sequence, and provides for restarting at the same point. The setstate() function changes the state array used by the random() function. The state array state is used for random number generation until the next call to initstate() or setstate(). state must first have been initialized using initstate() or be the result of a previous call of setstate(). RETURN VALUE
The random() function returns a value between 0 and RAND_MAX. The srandom() function returns no value. The initstate() and setstate() functions return a pointer to the previous state array, or NULL on error. ERRORS
EINVAL A state array of less than 8 bytes was specified to initstate(). NOTES
Current "optimal" values for the size of the state array n are 8, 32, 64, 128, and 256 bytes; other amounts will be rounded down to the nearest known amount. Using less than 8 bytes will cause an error. CONFORMING TO
BSD 4.3 SEE ALSO
rand(3), srand(3) GNU
2000-08-20 RANDOM(3)
All times are GMT -4. The time now is 08:33 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy