GR(1)

NAME
	gr

SYNOPSIS
	gr [-ipw] [-t day] [-P file_pat] [-e file_ext] [-E file_ext] pattern dir ...

DESCRIPTION
	flags and options are:
    -i: same as "-i" flag of grep.
	-w: left/right adjacent characters to the pattern are restricted as follows:
		'([^_a-zA-Z]|^)'pattern'([^_0-9a-zA-Z]|$)'
		so that it makes convenient to search names in programming language.
	-p: Print only the path element in dir.
	-t day: serch files only within the day (passed from now).
	-P file_pat: serch files only of the pattern.
	-e file_ext: serch files only with the extension.
	-E file_ext: serch files only with the extension.

	It is possible to have multiple "-P", "-e" and "-E". Then they are combined
	with "or" operation.
	"-E" is used to abbreviate multiple single letter extensions. For example,
	"-E ch" is just "-e c -e h".

SOURCE
	http://p9.nyx.link/netlib/cmd/gr/

AUTHER
	Kenji Arisawa