#!/bin/bash# Manipulate options in a .config file from the command line usage() {	cat >&2 <<EOLManipulate options in a .config file from the command line.Usage:config options command ...commands:	--enable|-e option   Enable option	--disable|-d option  Disable option	--module|-m option   Turn option into a module	--set-str option value	                     Set option to "value"	--state|-s option    Print state of option (n,y,m,undef) 	--enable-after|-E beforeopt option                             Enable option directly after other option	--disable-after|-D beforeopt option                             Disable option directly after other option	--module-after|-M beforeopt option                             Turn option into module directly after other option 	commands can be repeated multiple times options:	--file .config file to change (default .config) config doesn't check the validity of the .config file. This is done at next make time.EOL	exit 1} checkarg() {	ARG="$1"	if [ "$ARG" = "" ] ; then		usage	fi	case "$ARG" in	CONFIG_*)		ARG="${ARG/CONFIG_/}"		;;	esac	ARG="`echo $ARG | tr a-z A-Z`"} set_var() {	local name=$1 new=$2 before=$3 	name_re="^($name=|# $name is not set)"	before_re="^($before=|# $before is not set)"	if test -n "$before" && grep -Eq "$before_re" "$FN"; then		sed -ri "/$before_re/a $new" "$FN"	elif grep -Eq "$name_re" "$FN"; then		sed -ri "s:$name_re.*:$new:" "$FN"	else		echo "$new" >>"$FN"	fi} if [ "$1" = "--file" ]; then	FN="$2"	if [ "$FN" = "" ] ; then		usage	fi	shift 2else	FN=.configfi if [ "$1" = "" ] ; then	usagefi while [ "$1" != "" ] ; do	CMD="$1"	shift	case "$CMD" in	--refresh)		;;	--*-after)		checkarg "$1"		A=$ARG		checkarg "$2"		B=$ARG		shift 2		;;	--*)		checkarg "$1"		shift		;;	esac	case "$CMD" in	--enable|-e)		set_var "CONFIG_$ARG" "CONFIG_$ARG=y"		;; 	--disable|-d)		set_var "CONFIG_$ARG" "# CONFIG_$ARG is not set"		;; 	--module|-m)		set_var "CONFIG_$ARG" "CONFIG_$ARG=m"		;; 	--set-str)		set_var "CONFIG_$ARG" "CONFIG_$ARG=\"$1\""		shift		;; 	--state|-s)		if grep -q "# CONFIG_$ARG is not set" $FN ; then			echo n		else			V="$(grep "^CONFIG_$ARG=" $FN)"			if [ $? != 0 ] ; then				echo undef			else				V="${V/CONFIG_$ARG=/}"				V="${V/\"/}"				echo "$V"			fi		fi		;; 	--enable-after|-E)		set_var "CONFIG_$B" "CONFIG_$B=y" "CONFIG_$A"		;; 	--disable-after|-D)		set_var "CONFIG_$B" "# CONFIG_$B is not set" "CONFIG_$A"		;; 	--module-after|-M)		set_var "CONFIG_$B" "CONFIG_$B=m" "CONFIG_$A"		;; 	# undocumented because it ignores --file (fixme)	--refresh)		yes "" | make oldconfig		;; 	*)		usage		;;	esacdone