rgrep:  Recurse down directory tree and egrep ordinary files for patterns.
	It is essentially a marriage of the "find" and "egrep" commands with
	(presumably) a less awkward syntax.

Usage:
	rgrep [<rgrep_opts>] [--] [<egrep_opts>] <pattern>

where <rgrep_opts> can be:

	-help		this help.
	-debug -D	no action, just print command line parse.
	-d <dir>	find files starting in <dir> instead of "."
			put a list of dir's space separated inside quotes. 
	-cmd <cmd>	use <cmd> instead of "egrep".
	-file <pattern>	only do file basenames matching perl regexp <pattern>
	-path <pattern>	as -file, but apply regexp to full path.
	-q1		quote all the non - starting <egrep_opts> with: '
	-q2		quote all the non - starting <egrep_opts> with: "
	-q		same as -q1.
	-h		do not print filenames in output.
	-H		ONLY print filenames in output.
	-b,-bin		search non-text files as well.

Use "--" to signal end of <rgrep_opts>, if not present you are allowed
at most one rgrep_opt.

Examples:

	rgrep #include	
				Find all "#include" lines in this directory
				and all sub-directories. (non binary files).

	rgrep -h -q -- -i 'foo.*(bar)'
	
				Do not print out filenames. Quote the nasty
				regexp. Pass -i flag to egrep