Sed - Replacing numbers w/asteriks in random location in a file

Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Sed - Replacing numbers w/asteriks in random location in a file
# 8  
Old 10-03-2001
By the way, how fast does this run on large files?.. Do you have any to test it against?.....

Does anyone who knows regular expressions know a more efficient way of writing this regexp?.... I am certainly no expert with them, but this would seem to be a very handy thing to have (maybe even a cantidate for a faq or something?...)...

- dEvNuL
# 9  
Old 10-04-2001
dEvNuL, I have to give you credit for doing research. Thanks again.

I would mention one thing I found out about having the regexp all in one file -- the order is very important. I have to work with the longest numbers first to strike those out and then work with the second longest, etc. If I start out with 13 digits, part of the 19 or 16 digits gets strucked first (*) which means that the 16 digits/19 digit pattern search no longer finds a match... :-(

I ran this against a page of credit card number and it was instanteous. I don't think it will take long to process even 50 pages...

PS dEvNuL will be rightfully credited in my batch jobs.
# 10  
Old 10-04-2001
Yes, you are right.. THe order is important.. I should have mentioned that... Glad to hear it is working quickly for you.. ;>

- dEvNuL
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Homework & Coursework Questions

Random numbers

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted! Write a shell script that will take the sum of two random number? Ex: Random n1 +Random n2 = result i tries to write it but i had some dufficulties ... (3 Replies)
Discussion started by: renegade755
3 Replies

2. Shell Programming and Scripting

A way to store 2 random numbers from a for loop?

I have a for loop that cycles twice and generates 1 random number for each pass through. I would like to be able to store the two numbers to use later for arithmetics. Is there a way to do that? Right now I can only seem to use the last random number for anything. Thanks. (4 Replies)
Discussion started by: AxlVanDamme
4 Replies

3. Shell Programming and Scripting

Random float numbers in BASH

Hi people :) I'm learning shell scripting using bash and I want to generate 4 floating point number with 5 decimal places and write them to a file and a variable. I've done all this except the $RAMDOM enviroment variable does not generate a float number but a integrer. I hope you could... (3 Replies)
Discussion started by: pharaoh
3 Replies

4. Shell Programming and Scripting

Replace a random string of numbers

Hi Can someone help me with this one? I have string.. (PROC_PROC_ID == 12183) <--PID is dynamic and i want to replace the PID number with whatever PID from /opt/hpws/apache32_2/logs/ file. i'm having problem since the PID on the string is dynamic. It may be 2-5 digits or more. ... (5 Replies)
Discussion started by: ryandegreat25
5 Replies

5. Shell Programming and Scripting

Generating random numbers

Hi, I am having trouble with generating random numbers. can this be done with awk? So I have a file that looks like this: 23 30 24 40 26 34 So column1 is start and column2 is end. I want to generate 3 random #'s between start and stop: So the output will look like this: ... (9 Replies)
Discussion started by: phil_heath
9 Replies

6. Shell Programming and Scripting

Random Numbers - Perl

Hi Guys I have a script to find Ranomd numbers. But I want to make the file to produce more random. Could u guys help me plz. In this Script I have the code that generates random in for loop and the range I have specified in my %chromlength input and out put will be like this chrno start end... (3 Replies)
Discussion started by: repinementer
3 Replies

7. UNIX for Dummies Questions & Answers

Retrieving random numbers out of a text file

Hi one and all, I'm working on a Bash script that is designed to calculate how much IP traffic has passed through a port to determine traffic volume over a given amount of time. I've currently been able to use the netstat -s command coupled with grep to write to a file the total packets... (13 Replies)
Discussion started by: nistleloy
13 Replies

8. Shell Programming and Scripting

Random numbers from 0 to 1000

Hello All, I want to make a simple script which generate random number from 0 to 1000. and simply display it. Plz HELP!!!!!! Regards, Waqas Ahmed (2 Replies)
Discussion started by: wakhan
2 Replies

9. UNIX for Dummies Questions & Answers

Random numbers without repetition

Is anyone know some scripts to generate random number without repetition using bash; for example generate 10 different random numbers. Thanks (8 Replies)
Discussion started by: asal_email
8 Replies
Login or Register to Ask a Question