--- 1.0.5-dm-crypt-stop.sh
+++ 1.0.5-dm-crypt-stop.sh
@@ -22,17 +22,17 @@
 		eend $? "Failed to remove dm-crypt mapping for: ${target}"
 	done
 
-	if [[ -n $(/bin/egrep -e "^(source=)./dev/loop*" /etc/conf.d/dmcrypt) ]] ; then
+	if [ -n "$(/bin/egrep -e '^(source=)./dev/loop*' /etc/conf.d/dmcrypt)" ] ; then
 		einfo "Taking down any dm-crypt loop devices"
 		/bin/egrep -e "^(source)" /etc/conf.d/dmcrypt | while read sourceline
 		do
 			source=
 			eval ${sourceline}
-			if [[ -n $(echo ${source} | grep /dev/loop) ]] ; then
+			case ${source} in */dev/loop*)
 				ebegin "   Taking down ${source}"
 				/sbin/losetup -d ${source}
 				eend $? "  Failed to remove loop"
-			fi
+			;; esac
 		done
 	fi
 fi
--- 1.0.6-r2-dm-crypt-start.sh
+++ 1.0.6-r2-dm-crypt-start.sh
@@ -14,7 +14,7 @@
 dm_crypt_execute_dmcrypt() {
 	local dev ret mode foo
 	# some colors
-	local red='\x1b[31;01m' green='\x1b[32;01m' off='\x1b[0;0m'
+	local red='\033[31;01m' green='\033[32;01m' off='\033[0;0m'
 
 	if [ -n "$target" ]; then
 		# let user set options, otherwise leave empty
@@ -40,7 +40,7 @@
 		return
 	fi
 
-	if [[ -n ${loop_file} ]] ; then
+	if [ -n "${loop_file}" ] ; then
 		dev="/dev/mapper/${target}"
 		ebegin "  Setting up loop device ${source}"
 		/sbin/losetup ${source} ${loop_file}
@@ -63,12 +63,16 @@
 	if [ -n "$key" ]; then
 		read_abort() {
 			local ans
-			local prompt=" ${green}*${off}  $1? (${red}yes${off}/${green}No${off}) "
-			shift
-			echo -n -e "${prompt}"
-			if ! read -n 1 $* ans ; then
-				local back=${prompt//?/\\b}
-				echo -n -e "${back}"
+			local prompt=" ${green}*${off}  %s? (${red}yes${off}/${green}No${off}) "
+			printf "${prompt}" "$1"
+			if ! read ans ; then
+				local prompttext=" *  $1? (yes/No) $ans"
+				local back=""
+				while [ -n "$prompttext" ]; do
+					back="$back"'\b'
+					prompttext=${prompttext%?}
+				done
+				printf "${back}"
 			else
 				echo
 			fi
@@ -79,8 +83,8 @@
 		}
 
 		# Notes: sed not used to avoid case where /usr partition is encrypted.
-		mode=${key/*:/} && ( [ "$mode" == "$key" ] || [ -z "$mode" ] ) && mode=reg
-		key=${key/:*/}
+		mode=${key##*:} && ( [ "$mode" = "$key" ] || [ -z "$mode" ] ) && mode=reg
+		key=${key%%:*}
 		case "$mode" in
 		gpg|reg)
 			# handle key on removable device
@@ -114,7 +118,7 @@
 							&& foo="mount failed" \
 							|| foo="mount source not found"
 					fi
-					((++i))
+					i=$(( $i + 1 ))
 					read_abort "Stop waiting after $i attempts (${foo})" -t 1 && return
 				done
 			else    # keyfile ! on removable device
@@ -136,17 +140,18 @@
 	fi
 	ebegin "dm-crypt map ${target}"
 	einfo "cryptsetup will be called with : ${options} ${arg1} ${arg2} ${arg3}"
-	if [ "$mode" == "gpg" ]; then
+	if [ "$mode" = "gpg" ]; then
 		: ${gpg_options:='-q -d'}
 		# gpg available ?
-		if type -p gpg >/dev/null ; then
-			for (( i = 0 ; i < 3 ; i++ ))
+		if command -v gpg >/dev/null 2>&1; then
+			i=0; while [ $i -lt 3 ]
 			do
 				# paranoid, don't store key in a variable, pipe it so it stays very little in ram unprotected.
 				# save stdin stdout stderr "values"
 				gpg ${gpg_options} ${key} 2>/dev/null | cryptsetup ${options} ${arg1} ${arg2} ${arg3}
 				ret="$?"
 				[ "$ret" -eq 0 ] && break
+				i=$(( $i + 1 ))
 			done
 			eend "${ret}" "failure running cryptsetup"
 		else
@@ -156,7 +161,7 @@
 			einfo "If you have /usr on its own partition, try copying gpg to /bin ."
 		fi
 	else
-		if [ "$mode" == "reg" ]; then
+		if [ "$mode" = "reg" ]; then
 			cryptsetup ${options} -d ${key} ${arg1} ${arg2} ${arg3}
 			ret="$?"
 			eend "${ret}" "failure running cryptsetup"
@@ -172,10 +177,10 @@
 	fi
 	splash svc_input_end ${SVCNAME} >/dev/null 2>&1
 
-	if [[ ${ret} != 0 ]] ; then
+	if [ ${ret} -ne 0 ] ; then
 		cryptfs_status=1
 	else
-		if [[ -n ${pre_mount} ]] ; then
+		if [ -n "${pre_mount}" ] ; then
 			dev="/dev/mapper/${target}"
 			ebegin "  Running pre_mount commands for ${target}"
 			eval "${pre_mount}" > /dev/null
@@ -199,12 +204,12 @@
 	fi
 
 	mount_point=$(grep "/dev/mapper/${target}" /proc/mounts | cut -d' ' -f2)
-	if [[ -z ${mount_point} ]] ; then
+	if [ -z "${mount_point}" ] ; then
 		ewarn "Failed to find mount point for ${target}, skipping"
 		cryptfs_status=1
 	fi
 
-	if [[ -n ${post_mount} ]] ; then
+	if [ -n "${post_mount}" ] ; then
 		ebegin "Running post_mount commands for target ${target}"
 		eval "${post_mount}" >/dev/null
 		eend $? || cryptfs_status=1
@@ -218,16 +223,19 @@
 			echo "usage: strlen <variable_name>"
 			die
 		fi
-	eval echo "\${#${1}}"
+	local s c
+	eval "s=\$$1"
+	c=0; while [ -n "$s" ]; do c=$(( $c + 1 )); s=${s%?}; done
+	echo $c
 }
 
 # Lookup optional bootparams
 parse_opt() {
 	case "$1" in
 		*\=*)
-			local key_name="`echo "$1" | cut -f1 -d=`"
+			local key_name=${1%%=*}
 			local key_len=`strlen key_name`
-			local value_start=$((key_len+2))
+			local value_start=$(( $key_len + 2 ))
 			echo "$1" | cut -c ${value_start}-
 		;;
 	esac
@@ -249,7 +257,7 @@
 	esac
 done
 
-if [[ -f /etc/conf.d/dmcrypt ]] && [[ -x /sbin/cryptsetup ]] ; then
+if [ -f /etc/conf.d/dmcrypt ] && [ -x /sbin/cryptsetup ] ; then
 	ebegin "Setting up dm-crypt mappings"
 
 	# Fix for baselayout-1.12.10 (bug 174256)
@@ -257,7 +265,7 @@
 
 	while read targetline ; do
 		# skip comments and blank lines
-		[[ ${targetline}\# == \#* ]] && continue
+		case ${targetline} in ''|'#'*) continue;; esac
 
 		# check for the start of a new target/swap
 		case ${targetline} in
@@ -270,7 +278,7 @@
 				;;
 
 			gpg_options=*|remdev=*|key=*|loop_file=*|options=*|pre_mount=*|post_mount=*|source=*)
-				if [[ -z ${target} && -z ${swap} ]] ; then
+				if [ -z "${target}" ] && [ -z "${swap}" ] ; then
 					ewarn "Ignoring setting outside target/swap section: ${targetline}"
 					continue
 				fi
--- dm-crypt-start.sh
+++ dm-crypt-start.sh
@@ -9,17 +9,17 @@
 dm-crypt-execute-checkfs() {
 	local dev target ret
 
-	if [[ -n ${loop_file} ]] ; then
+	if [ -n "${loop_file}" ] ; then
 		dev="/dev/mapper/${target}"
 		ebegin "  Setting up loop device ${source}"
 		/sbin/losetup ${source} ${loop_file} 
 	fi
 
-	if [[ -n ${mount} ]] ; then
+	if [ -n "${mount}" ] ; then
 		target=${mount}
 		: ${options:='-c aes -h sha1'}
-		[[ -n ${key} ]] && : ${gpg_options:='-q -d'}
-	elif [[ -n ${swap} ]] ; then
+		[ -n "${key}" ] && : ${gpg_options:='-q -d'}
+	elif [ -n "${swap}" ] ; then
 		target=${swap}
 		: ${options:='-c aes -h sha1 -d /dev/urandom'}
 		: ${pre_mount:='mkswap ${dev}'}
@@ -34,16 +34,16 @@
 
 	splash svc_input_begin checkfs
 	ebegin "dm-crypt map ${target}"
-	if [[ -z ${key} ]] ; then
+	if [ -z "${key}" ] ; then
 		/bin/cryptsetup ${options} create ${target} ${source} >/dev/console </dev/console
 		ret=$?
 		eend ${ret} "failure running cryptsetup"
 	else
-		if type -p gpg >/dev/null ; then
+		if command -v gpg >/dev/null 2>&1; then
 			ret=1
-			while [[ ${ret} -gt 0 ]] ; do
+			while [ ${ret} -gt 0 ] ; do
 				keystring=$(gpg ${gpg_options} ${key} 2>/dev/null </dev/console)
-				if [[ -z ${keystring} ]] ; then
+				if [ -z "${keystring}" ] ; then
 					ret=5
 				else
 					echo ${keystring} | /bin/cryptsetup ${options} create ${target} ${source}
@@ -57,10 +57,10 @@
 	fi
 	splash svc_input_end checkfs
 
-	if [[ ${ret} != 0 ]] ; then
+	if [ ${ret} -ne 0 ] ; then
 		cryptfs_status=1
 	else
-		if [[ -n ${pre_mount} ]] ; then
+		if [ -n "${pre_mount}" ] ; then
 			dev="/dev/mapper/${target}"
 			ebegin "  Running pre_mount commands for ${target}"
 			eval "${pre_mount}" > /dev/null
@@ -75,7 +75,7 @@
 dm-crypt-execute-localmount() {
 	local mount_point target
 
-	if [[ -n ${mount} && -n ${post_mount} ]] ; then
+	if [ -n "${mount}" ] && [ -n "${post_mount}" ] ; then
 		target=${mount}
 	else
 		return
@@ -88,12 +88,12 @@
 	fi
 
 	mount_point=$(grep "/dev/mapper/${target}" /proc/mounts | cut -d' ' -f2)
-	if [[ -z ${mount_point} ]] ; then
+	if [ -z "${mount_point}" ] ; then
 		ewarn "Failed to find mount point for ${target}, skipping"
 		cryptfs_status=1
 	fi
 
-	if [[ -n ${post_mount} ]] ; then
+	if [ -n "${post_mount}" ] ; then
 		ebegin "Running post_mount commands for target ${target}"
 		eval "${post_mount}" >/dev/null
 		eend $? || cryptfs_status=1
@@ -103,12 +103,12 @@
 local cryptfs_status=0 
 local gpg_options key loop_file mount mountline options pre_mount post_mount source swap
 
-if [[ -f /etc/conf.d/cryptfs ]] && [[ -x /bin/cryptsetup ]] ; then
+if [ -f /etc/conf.d/cryptfs ] && [ -x /bin/cryptsetup ] ; then
 	ebegin "Setting up dm-crypt mappings"
 
 	while read mountline ; do
 		# skip comments and blank lines
-		[[ ${mountline}\# == \#* ]] && continue
+		case ${mountline} in ''|'#'*) continue;; esac
 
 		# check for the start of a new mount/swap
 		case ${mountline} in
@@ -121,7 +121,7 @@
 				;;
 
 			gpg_options=*|key=*|loop_file=*|options=*|pre_mount=*|post_mount=*|source=*)
-				if [[ -z ${mount} && -z ${swap} ]] ; then
+				if [ -z "${mount}" ] && [ -z "${swap}" ] ; then
 					ewarn "Ignoring setting outside mount/swap section: ${mountline}"
 					continue
 				fi
--- dm-crypt-stop.sh
+++ dm-crypt-stop.sh
@@ -32,17 +32,17 @@
 		eend $? "Failed to remove dm-crypt mapping for: ${target}"
 	done
 
-	if [[ -n $(/bin/egrep -e "^(source=)./dev/loop*" /etc/conf.d/cryptfs) ]] ; then
+	if [ -n "$(/bin/egrep -e '^(source=)./dev/loop*' /etc/conf.d/cryptfs)" ] ; then
 		einfo "Taking down any dm-crypt loop devices"
 		/bin/egrep -e "^(source)" /etc/conf.d/cryptfs | while read sourceline
 		do
 			source=
 			eval ${sourceline}
-			if [[ -n $(echo ${source} | grep /dev/loop) ]] ; then
+			case ${source} in */dev/loop*)
 				ebegin "   Taking down ${source}"
 				/sbin/losetup -d ${source}
 				eend $? "  Failed to remove loop"
-			fi
+			;; esac
 		done
 	fi
 fi