#!/bin/sh -
#
#   Copyright (C) 2005 by Oliver Fromme  <olli@fromme.com>  <olli@secnetix.de>
#   All rights reserved. 2-clause BSD copyright/license and disclaimer applies.
#
#   This is a wrapper for sysctl(8) with the following two
#   features:
#
#   1.  "sysctl" without any arguments will behave as if the
#       -a option has been specified (similar to ifconfig(8)).
#
#   2.  If only one argument is present that contains an
#       asterisk, it is interpreted as a wildcard pattern.
#       So, the following
#               sysctl kern.max*
#       is translated to:
#               sysctl -a | grep '^kern\.max.*:'
#       The exit value is 0 if any matching sysctl variables
#       were found and displayed, otherwise (no matches) the
#       exit code is 1.
#
#   In all other cases the wrapper behaves exactly like the
#   original sysctl(8).
#
#   I suggest that you store this script as "sysctl.wrapper",
#   and then make an alias sysctl="noglob sysctl.wrapper".
#

if [ $# -eq 0 ]; then
	exec sysctl -a
elif [ $# -eq 1 ]; then
	case "$1" in
		-*)
			;;
		*"*"*)
			OID="$1"
			while [ -n "$OID" ]; do
				case "$OID" in
					*.*"*"*)
						OID="${OID%.*}" ;;
					*"*"*)
						OID="-a" ;;
					*)
						break ;;
				esac
			done
			PATTERN=$(echo "$1" | sed 's/\./\\./g;s/\*/.*/g')
			sysctl $OID | grep "^${PATTERN}:"
			exit $?
			;;
	esac
fi

exec sysctl "$@"

#--