diff --git a/keymanagement.sh b/keymanagement.sh
index 04c1dd1..cb2ec2a 100644
--- a/keymanagement.sh
+++ b/keymanagement.sh
@@ -45,11 +45,11 @@ function ssh-init-agent() {
 	local ECHO="/bin/echo"
 	local SSH_AGENT="/usr/bin/ssh-agent"
 
-	[[ -e "${SSH_AGENT_FILE}" ]] && eval `${CAT} "${SSH_AGENT_FILE}"` >/dev/null
+	[[ -e "${SSH_AGENT_FILE}" ]] && eval $(${CAT} "${SSH_AGENT_FILE}") >/dev/null
 
 	if [[ "x" != x${SSH_AGENT_PID} ]]
 	then
-		if [[ "ssh-agent" = "`${PS} -p ${SSH_AGENT_PID} -o comm=`" ]]
+		if [[ "ssh-agent" = "$(${PS} -p ${SSH_AGENT_PID} -o comm=)" ]]
 		then
 			return
 		fi
@@ -59,7 +59,7 @@ function ssh-init-agent() {
 	${SSH_AGENT} >"${SSH_AGENT_FILE}"
 	if [[ 0 -eq $? ]]
 	then
-		eval `${CAT} "${SSH_AGENT_FILE}"` >/dev/null
+		eval $(${CAT} "${SSH_AGENT_FILE}") >/dev/null
 		${ECHO} "OK"
 		ssh-add
 	else
diff --git a/tools/background b/tools/background
index 1db8664..e9c0d37 100755
--- a/tools/background
+++ b/tools/background
@@ -29,7 +29,6 @@ function background() {
 	local TEMPFILE="/bin/tempfile"
 	local IDENTIFY="/usr/bin/identify"
 	local CONVERT="/usr/bin/convert"
-	local SETROOT="/usr/bin/feh"
 	local ECHO="/bin/echo"
 	local EXPR="/usr/bin/expr"
 	local WC="/usr/bin/wc"