Commands Help : grep

•  print lines matching a pattern

[SYNOPSIS] grep OPTION PATTERN FILE

option -i Ignore case distinctions in both the PATTERN and the input files -n Prefix each line of output with the 1-based line number within its input file -v Invert the sense of matching, to select non-matching lines -w Select only those lines containing matches that form whole words -r(R) dir Read all files under each directory, recursively; this is equivalent to the -d recurse option # grep -r 'word' dir