Search for a pattern in a file: `grep “pattern” file.txt`
Search for a pattern in multiple files: `grep “pattern” file1.txt file2.txt`
Search recursively in a directory: `grep -r “pattern” /path/to/dir`
Ignore case: `grep -i “pattern” file.txt`
Show line numbers: `grep -n “pattern” file.txt`
Match whole words only: `grep -w “pattern” file.txt`
Invert the match: `grep -v “pattern” file.txt`
Count matching lines: `grep -c “pattern” file.txt`
Show only matching text: `grep -o “pattern” file.txt`
Search using a regular expression: `grep -E “pat1|pat2” file.txt`
Search for lines starting with text: `grep “^pattern” file.txt`
Search for lines ending with text: `grep “pattern$” file.txt`
Search in command output: `command | grep “pattern”`
Search and include context lines before and after: `grep -B 2 -A 2 “pattern” file.txt`
List files containing matches: `grep -l “pattern” *.txt`
List files without matches: `grep -L “pattern” *.txt`
Suppress error messages: `grep -s “pattern” file.txt`
Use fixed-string search: `grep -F “pattern” file.txt`
Search compressed files with zgrep: `zgrep “pattern” file.gz`
Combine common options: `grep -rinw “pattern” /path/to/dir`