Hi,

We are running DHCP Server over Centos 6.4. All of ip address and MAC entries are stored in same file. Problem is that there are lots of entries and i want to find particular ip address or mac address.

Please tell me simple command to find with Procedure:

1. ip address = 192.168.13.23
2. MAC address = 45:r5:6y:88:qw:33


KS

Pagers and editors have search function.

You've been registered here 3.5 years and don't know how to do a simple search ?. Don't you take any notice ?.

"man grep"

You could use egrep to search for both:

egrep -i "192.168.13.23|45:r5:6y:88:qw:33" <filename>

The -i tells it to ignore case (MAC addresses can have upper or lower case letters).

The double quotes show the beginning and end of what you're searching for.

The pipe sign is "or" when used with egrep like this to it says to search and find either the IP or the MAC (or both if both are there).

Hi Syg00,

This type of words demotivate users or newbie so please write after much thought and consideration.
As per your thinking , If any user from since 5 years on this portal then he should be expert in Linux.
I also aware from GREP command and tried but no luck.

It is not necessary that all registered users are totally involve in only Linux profile, I Have 7 years
Experience in IT field and working on many profiles ( like as Windows, SAN, SQL DB, ERP, and Linux ).

As i am seeing you are joined since 2003, can i expect from you to solve my problem ?


KS

Two other options which can come in handy with grep are -B and -A

(And for what it's worth egrep is also the same as grep -E)

Also BE AWARE that CentOS 6.4 is unsupported and has been for some time
the only supported version in the 6 series is 6.7 ( or 6.8 if it has been released )

cent only supports the ONE current minor version
6.4 is missing about 1.5 YEARS of security updates

please double check the release version

as to finding the line of test
open the gedit search function

or

use grep with cat