Grep is a command-line utility that searches
for text that matches a specified regular expression or a pattern and
use CLI commands to filter the command output.
| Option | Description |
|---|
| -i | Ignores case, i.e., the search is irrespective
of uppercase or lowercase. |
| -v | Inverts match, i.e., returns results that do
not have the specified search string. |
| -w | Matches words or regular expressions, i.e.
returns only those lines which contain matches that form whole words. |
| -F | Interprets patterns as a list of fixed strings
instead of regular expressions. |
An example of grep command usage is shown as
follows:
Output without grep
#dump interface status
interface=controller1
Interface : controller 1
Device : eth0
ID : 15257577339130077
MAC Address : 00:50:56:a7:7a:e9
State : up
Last Change : 2018-08-22 11:06:21.450667117 +0000 UTC
Duplex : full
Speed : 1000Mbps
Address : 172.20.74.134/22
Route : 0.0.0.0/0 via 172.20.75.254 metric 0
DNS Server : 172.18.18.160
DNS Server : 172.30.30.250
DNS Search : google.com
Output with grep
#dump interface status interface=controller1
| grep Add
MAC Address : 00:50:56:a7:7a:e9
Address : 172.20.74.134/22
