Solved

Understanding GREP

Posted on 2013-01-15
7
595 Views
Last Modified: 2013-01-17
What is GREP?
What does the acronym stand for?
What is an example of how it is used?
0
Comment
Question by:yip459
  • 2
  • 2
  • 2
  • +1
7 Comments
 
LVL 44

Assisted Solution

by:Darr247
Darr247 earned 200 total points
ID: 38781631
Global Regular Expression Parser answers 1 and 2.

rpm -qa | grep -i vga
That example queries all rpm packages installed on a redhat package manager system (like RedHat, fedora, CentOS) and pipes the results to grep, which filters the output down to packages with the sequence "vga" in the title. The -i switch makes grep case-insensitive, so "vga" would match, as would VGA, Vga, vgA, WavGain, etc.
0
 
LVL 37

Assisted Solution

by:Gerwin Jansen
Gerwin Jansen earned 100 total points
ID: 38781637
Or if you want to find something in a file:

grep -i something /path/to/somefile
0
 
LVL 44

Assisted Solution

by:Darr247
Darr247 earned 200 total points
ID: 38781642
For any linux command, you should be able to run
$ man [command]
and get a help manual for that command.
e.g.
$ man grep
0
Complete VMware vSphere® ESX(i) & Hyper-V Backup

Capture your entire system, including the host, with patented disk imaging integrated with VMware VADP / Microsoft VSS and RCT. RTOs is as low as 15 seconds with Acronis Active Restore™. You can enjoy unlimited P2V/V2V migrations from any source (even from a different hypervisor)

 
LVL 84

Assisted Solution

by:ozo
ozo earned 100 total points
ID: 38781650
Its name comes from the ed command g/re/p (global / regular expression / print
0
 
LVL 28

Accepted Solution

by:
burrcm earned 100 total points
ID: 38781671
So in summary, find a (G)lobally (R)epeating (E)xpression and (P)rint it, meaning display anything which contains the search string entered.

Chris B
0
 
LVL 84

Expert Comment

by:ozo
ID: 38786192
regular expression, (http://en.wikipedia.org/wiki/Regular_expression#Formal_definition)
not (R)epeating (E)xpression
0
 
LVL 28

Expert Comment

by:burrcm
ID: 38786253
True. Missed by that much...

Chris B
0

Featured Post

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Little introduction about CP: CP is a command on linux that use to copy files and folder from one location to another location. Example usage of CP as follow: cp /myfoder /pathto/destination/folder/ cp abc.tar.gz /pathto/destination/folder/ab…
Every server (virtual or physical) needs a console: and the console can be provided through hardware directly connected, software for remote connections, local connections, through a KVM, etc. This document explains the different types of consol…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.

867 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now