$ cheat grep # Basic: grep pattern file # case nonsensitive research: grep -i pattern file # Recursively grep for string in folder: grep -R pattern folder # Getting pattern from file (one by line): grep -f pattern_file file # Find lines NOT containing pattern grep -v pattern file # You can grep with regular expressions grep "^00" file #Match lines starting with 00 grep -E "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}" file #Find IP add # Find all files who contain {pattern} in the directory {directory}. # This will show: "file:line my research" grep -rnw 'directory' -e "pattern" # Exclude grep from your grepped output of ps. # Add [] to the first letter. Ex: sshd -> [s]shd ps aux | grep '[h]ttpd ## grep's -A 1 option will give you one line after; -B 1 will give you one line before; and -C 1 combines both to give you one line both before and after.