Syntax Help | unix | grep | regular expression

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

grep : regular expression

guys, my requirment goes like this: I have a file, and wish to filter out records where 1. The first letter is o or O and 2. The next 4 following letter should not be ther I do not wish to use pipe and wish to do it in one shot. The best expression I came up with is: grep ^*...

2. UNIX for Advanced & Expert Users

regarding grep regular expression

When i do ls -ld RT_BP* i am getting the following list. drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP809 drwxrwx--- 2user group 256 Oct 17 10:09 RT_BP809.O drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP810 drwxrwx--- 2user group 256 Oct...

3. Shell Programming and Scripting

grep with regular expression

Hi, guys. I have one question, hope somebody can give me a hand I have a file called passwd, the contents of it arebelow: *********************** ... goldsimj:x:5008:200: goldsij2:x:5009:200: whitej:x:5010:201: brownj:x:5011:202: goldsij3:x:5012:204: greyp:x:5013:203: ......

4. Shell Programming and Scripting

grep regular expression

please can someone tell me what the following regrex means grep "^aa*$" <file> I thought this would match any word beginning with aa and ending with $, but it doesnt. Thanks in advance Calypso

5. UNIX for Dummies Questions & Answers

Help | unix | grep | regular expression

I have the following code: ls -al /bin | tr -s ' ' | grep 'x' ls -al: Lists all the files in a given director such as /bin tr -s ' ': removes additional spaces between characters so that there is only one space grep 'x': match all "x" characters that are followed by a whitespace. I was...

6. UNIX for Dummies Questions & Answers

Help | Unix | grep | regular expression | backreference | Syntax/Logic

Hello, I'm working on learning regular expressions and what I can do with them. I'm using unix to and its programs to experiment and learn what my limitations are with them. I'm working on duplicating the regular expression: ^(.*)(\r?\n\1)+$ This is supposed to delete duplicate lines...

7. Shell Programming and Scripting

grep and regular expression

Hi, I am executing a svnlook command to check to see if the following line exists. I need a regular expression to represent the line. A /test/test1/qa/test2/index.html A /test/test1/qa/test3/test.jpg A /test/test1/qa/test3/test1.jpg A /test/test1/qa/test4/test.swf I just need to extract...

8. Programming

Perl: How to read from a file, do regular expression and then replace the found regular expression

Hi all, How am I read a file, find the match regular expression and overwrite to the same files. open DESTINATION_FILE, "<tmptravl.dat" or die "tmptravl.dat"; open NEW_DESTINATION_FILE, ">new_tmptravl.dat" or die "new_tmptravl.dat"; while (<DESTINATION_FILE>) { # print...

9. Shell Programming and Scripting

Help with awk script (syntax error in regular expression)

I've found this script which seems very promising to solve my issue: To search and replace many different database passwords in many different (.php, .pl, .cgi, etc.) files across my filesystem. The passwords may or may not be contained within quotes, single quotes, etc. #!/bin/bash...

10. UNIX for Beginners Questions & Answers

Grep regular expression

I want to track only below: I am using below, but it doesn't work:

LEARN ABOUT DEBIAN

cache::ref::clock

Cache::Ref::CLOCK(3pm)					User Contributed Perl Documentation				    Cache::Ref::CLOCK(3pm)

NAME

       Cache::Ref::CLOCK - CLOCK cache replacement algorithm

SYNOPSIS

	   my $c = Cache::Ref::CLOCK->new(
	       size => $n,
	       k    => $k,
	   );

DESCRIPTION

       This algorithm is provides a second chance FIFO cache expiry policy using a circular buffer.

       It is a very well accepted page replacement algorithm, but largely for reasons which are irrelevant in this context (cache hits don't need
       to be serialized in a multiprocessing context as they only require an idempotent operation (setting a bit to 1)).

ATTRIBUTES

       size
	   The size of the live entries.

       k   This is the initial value given to all hit entries.

	   As the hand moves through the circular buffer it decrements the counters.

	   The default is 1, providing semantics similar to a second chance FIFO cache.

	   Larger values of "k" model LRU more accurately.

	   This is pretty silly though, as Cache::Ref::LRU is probably way more efficient for any "k" bigger than 1.

AUTHOR

       Yuval Kogman

COPYRIGHT AND LICENSE

       This software is copyright (c) 2010 by Yuval Kogman.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.12.4							    2010-09-23						    Cache::Ref::CLOCK(3pm)