GREP CLI

-i, Ignore Case sensitivity.
-a, Equivalent to --binary-files=text.
-v, Ignore.
 $, Ends with the Keyword. 
--color=always, Always display color highlight.

Searches a file(s) based on a Keyword and then Excludes Keywords:
grep --color=always -a -i ""Keyword1$"\|"Keyword2$"\|"Keyword3$"" "Location & Filename" "Location & Filename" | grep -v 'ExcludeKeyword1\|ExcludeKeyword2\|ExcludeKeyword3'

grep --color=always ""KEYWORD1"\|"KEYWORD2"\|"KEYWORD3"" "Location\FILE.EXTENSION" | tr '\n' ' ' | cut -d ":" -f1

Let's find all occurrences of the word test in DEMO.txt:
grep -n test Demo.txt

Partial Matches:
grep -n test DEMO.txt

Search for full word:
grep -n --word-regexp test DEMO.txt

search for Lines containing test:
grep -Pn 'test\w+' DEMO.txt

search 4 letter word beginning with test:
grep -Pn 'test\w\b' DEMO.txt

Search 3 digit numbers:
grep -Pn '\d\d\d' README.md | head

fixed String:
grep -Pn 'code.' src/data.go | head

Multiple Patterns:
grep -En -e make -e run README.md

Multiple Includes and Excludes:
grep -Pnr --include '*.go' --exclude '*_test.go' 'func'

Searches for beginning of website:
Option 1 - grep --color=always -a -i "http://\|https://" "Location & Filename"
Option 2 - grep -Eo '(http|https)://[^/"]+'

Searches for Ip Addresses:
grep --color=always -E -o "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" "Location & Filename"

Searches for All Ip Addresses and remove duplicates:
grep --color=always -E -o "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" "Location & Filename" | awk '!x[$0]++'

Search for ip address and remove private IPs:
grep --color=always -E -o "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" "Location & Filename" | grep -v -e 10.* -e 192.168.* -e "172\.\(1[6-9]\|2[0-9]\|3[0-1]\)\.*" | awk '!x[$0]++'

Search for ip address and remove private IPs and duplicates:
grep --color=always -a -i -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' "Location & Filename" | grep -v -e 10.* -e 192.168.* -e "172\.\(1[6-9]\|2[0-9]\|3[0-1]\)\.*" | awk '!x[$0]++'

Quick IP:
grep -P "(10.|192.168|172.1[6-9].|172.2[0-9].|172.3[01].).*