GREP COMMANDS

GREP COMMANDS

To search the pattern in a particular file

• grep "Nagaraju" filename.txt

To search a pattern without case insensitive

• grep -wi "nagaraju" filename.txt

To search a pattern before and after the 10  lines

• grep -win -A/B/C 10 "Nagaraju"   filename.txt

To display all file names which contains the searched pattern

• grep -win "Nagaraju"  ./* 

To display other than that the searched pattern

• grep   -v "Nagaraju" filename.txt
• grep   -vE  "pattern1|pattern2" filename.txt

Displaying the count of the number of matches

• grep  -c "Nagaraju"  filename.txt  

To check for the whole words in a file

• grep -w "Nagaraju" filename.txt

To show the line numbers of the matched pattern

• grep -n "Nagaraju" filename.txt

To Display the matched pattern

• grep -o "Nagaraju"  filename.txt

To display the matching pattern that starts/ends with a string

• grep "^Nagaraju" filename.txt
• grep "Nagaraju$" filename.txt

How to grep multiple 

• grep -E "Naga|Raju" filename.txt