Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Importance of \ [ ] + ? in grep Post 302353776 by tinku on Wednesday 16th of September 2009 07:30:38 AM
Old 09-16-2009
Importance of \ [ ] + ? in grep

What is the significance of special characters used in grep command.
Like \ [ ] + ?

What is the meaning of the below command:

Code:
grep -o "0078\([0-9]\)\+" $i | sort | uniq

Can i replace + with ?

Thanks,
tinku

Last edited by Franklin52; 09-16-2009 at 08:49 AM.. Reason: Correcting code tags
 

7 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

importance of '/dev' directory

Can any one tell me what is the importance of '/dev' directory in unix. Is there any possibility to get 'root' by using the files stored in this directory. Beleive me this is not for any hacking purpose. just for learning. Hopes a detail reply. thak you (1 Reply)
Discussion started by: madhu
1 Replies

2. Linux

cp first ~/bin what is ~ symbols importance in this.

What would be the importance of ~ in this command. cp first ~/bin Thanks from dumb (1 Reply)
Discussion started by: singh85
1 Replies

3. IP Networking

Importance of LS length in DB exchange start packet (OSPF protocol)?

Is there any importance of LS length in DB exchange packet of OSPF protocol as its should be always be 20 bytes. Is this length to be ignored (2 Replies)
Discussion started by: cosmic_egg
2 Replies

4. UNIX for Dummies Questions & Answers

How to set HIGH importance to a mail sent through mailx or sendmail command

I have written a script for sending automated email, reporting the running status of a cron scheduled work. Now, the issue is, my Project Manager wants, the mail should be received with HIGH IMPORTANCE. How can I do that, kindly anybody explain. Thank you so much. (3 Replies)
Discussion started by: mitte_dino
3 Replies

5. Shell Programming and Scripting

importance of /var/mail

Hi When an entry will be made to the file /var/mail/<user-id> . I have 100 scripts under a specific user id(dgircc) in cron .SO inrder to check the whether the script has sucessfully run or not and if not to generate an email if i mention the code like #!/bin/ksh -p 2 fsize=`ls -lrt... (0 Replies)
Discussion started by: mskalyani
0 Replies

6. Shell Programming and Scripting

Sort names in a list by order of importance

Hi, I have multiple list which is arranged by order of importance. I need to do sorting on these lists based on the last name of the user(initial), if user name does not have initial then first name is initial . Important thing is that the last name in the list is important. If there is two or... (1 Reply)
Discussion started by: pratapsingh
1 Replies

7. Shell Programming and Scripting

Understand the importance of -depth option in find command.

Hi All, Can you please help me in understanding the importance of -depth of find. I am trying to execute below code.find . -mtime +5 -name "*" -depth -exec ls -l {} \; But it is throwing below error.find: warning: you have specified the -depth option after a non-option argument -mtime,... (2 Replies)
Discussion started by: Girish19
2 Replies
ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME
zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files SYNOPSIS
zgrep [grep-flags] [--] pattern [files ...] zegrep [grep-flags] [--] pattern [file ...] zfgrep [grep-flags] [--] pattern [file ...] DESCRIPTION
zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1). The grep-flags and pattern arguments are passed on to grep(1). If an -e flag is found in the grep-flags, zgrep will not look for a pattern argument. zegrep calls egrep(1), while zfgrep calls fgrep(1). EXIT STATUS
In case of missing arguments or missing pattern, 1 will be returned, otherwise 0. SEE ALSO
egrep(1), fgrep(1), grep(1), gzip(1), zcat(1) AUTHORS
Thomas Klausner <wiz@NetBSD.org> BSD
December 28, 2003 BSD
All times are GMT -4. The time now is 10:21 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy