print lines matching a pattern |
-R, -r, --recursive Read all files under each directory, recursively; this is equivalent to the -d recurse option. |
-i, --ignore-case Ignore case distinctions in both the PATTERN and the input files. (-i is specified by POSIX.) |
-n, --line-number Prefix each line of output with the 1-based line number within its input file. (-n is specified by POSIX.) |