A function for converting mask bits to a mask address. For example: 32 => 255.255.255.255 24 => 255.255.255.0 22 => 255.255.252.0

bitsToMask.bash

#!/bin/bash

bitsToMask(){ 
	trace_log "bitsToMask" "$@" 
	if [ "$#" -eq 1 ]; then 
		bitsToMask "${1}" 0 "" 
	elif [ "${2}" -eq 4 ]; then 
		echo "${3%.}" 
	else 
		local BITS=${1} 
		local COUNT=${2} 
		local ADDR=${3} 
		(( COUNT++ )) 
		if [ "${BITS}" -ge 8 ]; then 
			ADDR="${ADDR}255." 
			(( BITS -= 8 )) 
		else 
			local ADDR_SEGMENT="$( bc <<<"256 - 2 ^ ( 8 - ${BITS} )" )." 
			ADDR="${ADDR}${ADDR_SEGMENT}" 
			BITS=0 
		fi 
		bitsToMask "${BITS}" "${COUNT}" "${ADDR}" 
	fi 
}