diff --git a/install.sh b/install.sh
index 9b616e2..f1e1e24 100755
--- a/install.sh
+++ b/install.sh
@@ -225,7 +225,7 @@ zaf_configure(){
 	zaf_get_option ZAF_AGENT_CONFIGD "Zabbix agent config.d" "/etc/zabbix/zabbix_agentd.conf.d/" "$INSTALL_MODE"
 	zaf_get_option ZAF_AGENT_BIN "Zabbix agent binary" "/usr/sbin/zabbix_agentd" "$INSTALL_MODE"
 	zaf_get_option ZAF_AGENT_RESTART "Zabbix agent restart cmd" "service zabbix-agent restart" "$INSTALL_MODE"
-	zaf_get_option ZAF_CACHE_DIR "Cache directory" "${ZAF_TMP_BASE}c/" "$INSTALL_MODE"
+	zaf_get_option ZAF_SUDOERSD "Sudo sudoers.d directory" "/etc/sudoers.d" "$INSTALL_MODE"
 	zaf_get_option ZAF_ZBXAPI_URL "Zabbix API url" "http://localhost/zabbix/api_jsonrpc.php" "$INSTALL_MODE"
 	zaf_get_option ZAF_ZBXAPI_USER "Zabbix API user" "zaf" "$INSTALL_MODE"
 	zaf_get_option ZAF_ZBXAPI_PASS "Zabbix API password" "" "$INSTALL_MODE"
@@ -257,7 +257,7 @@ zaf_configure(){
 	zaf_set_option ZAF_AGENT_CONFIGD "$ZAF_AGENT_CONFIGD"
 	zaf_set_option ZAF_AGENT_BIN "$ZAF_AGENT_BIN"
 	zaf_set_option ZAF_AGENT_RESTART "$ZAF_AGENT_RESTART"
-	zaf_set_option ZAF_CACHE_DIR "$ZAF_CACHE_DIR"
+	zaf_set_option ZAF_SUDOERSD "$ZAF_SUDOERSD"
 	zaf_set_option ZAF_ZBXAPI_URL "$ZAF_ZBXAPI_URL"
 	zaf_set_option ZAF_ZBXAPI_USER "$ZAF_ZBXAPI_USER"
 	zaf_set_option ZAF_ZBXAPI_PASS "$ZAF_ZBXAPI_PASS"
diff --git a/lib/cache.lib.sh b/lib/cache.lib.sh
index bc665f8..93d8695 100644
--- a/lib/cache.lib.sh
+++ b/lib/cache.lib.sh
@@ -1,13 +1,18 @@
 # Zaf cache related functions
 
-zaf_cache_init(){
-	[ -n "$ZAF_CACHE_DIR" ] && rm -rf "$ZAF_CACHE_DIR"
+zaf_cache_clean(){
+	if [ -n "$ZAF_CACHE_DIR" ]; then
+		zaf_wrn "Removing cache entries"
+		rm -rf "$ZAF_CACHE_DIR"
+	else
+		zaf_err "Cache dir not set."
+	fi
 	mkdir -p "$ZAF_CACHE_DIR"
 }
 
 # Get cache key from requested param
 zaf_cachekey(){
-	echo "$1" | md5sum - | cut -d ' ' -f 1
+	echo $1 | md5sum - | cut -d ' ' -f 1
 }
 
 # Put object into cache
@@ -18,9 +23,10 @@ zaf_tocache(){
 	local key
 	local value
 	local lifetime
-	key=$(zaf_cachekey "$1")
+	key=$(zaf_cachekey $1)
 	echo "$2" >$ZAF_CACHE_DIR/$key
 	touch -m -d "$3 seconds" $ZAF_CACHE_DIR/$key.tme
+	zaf_trc "Cache: Saving entry $1($key)"
 }
 
 # Put object into cache from stdin and copy to stdout
@@ -30,9 +36,10 @@ zaf_tocache_stdin(){
 	local key
 	local lifetime
 
-	key=$(zaf_cachekey "$1")
+	key=$(zaf_cachekey $1)
 	cat >$ZAF_CACHE_DIR/$key
 	touch -m -d "$3 seconds" $ZAF_CACHE_DIR/$key.tme
+	zaf_trc "Cache: Saving entry $1($key)"
 	cat $ZAF_CACHE_DIR/$key
 }
 
@@ -41,7 +48,7 @@ zaf_tocache_stdin(){
 zaf_fromcache(){
 	local key
 	local value
-	key=$(zaf_cachekey "$1")
+	key=$(zaf_cachekey $1)
 	if [ -f $ZAF_CACHE_DIR/$key ]; then
 		if [ "$ZAF_CACHE_DIR/$key.tme" -nt "$ZAF_CACHE_DIR/$key" ]; then
 			zaf_trc "Cache: serving $1($key) from cache"
diff --git a/lib/ctrl.lib.sh b/lib/ctrl.lib.sh
index 05f9b12..35612dc 100644
--- a/lib/ctrl.lib.sh
+++ b/lib/ctrl.lib.sh
@@ -82,7 +82,25 @@ zaf_ctrl_check_deps() {
 	done
 }
 
-# Install binaries from control
+# Install sudo config from control
+# $1 plugin
+# $2 control
+# $3 plugindir
+zaf_ctrl_sudo() {
+	local pdir
+	local plugin
+
+	if ! which sudo >/dev/null; then
+		zaf_wrn "Sudo needed bud not installed?"
+	fi
+	pdir="$3"
+	plugin=$1
+	(echo -n "zabbix ALL=NOPASSWD: "
+	zaf_ctrl_get_global_option $2 "Sudo" | zaf_far '{PLUGINDIR}' "${plugindir}";
+	echo ) >$ZAF_SUDOERSD/zaf_$plugin
+}
+
+# Install sudo options from control
 # $1 pluginurl
 # $2 control
 # $3 plugindir
@@ -104,6 +122,7 @@ zaf_ctrl_install() {
 	[ -n "$cmd" ] && $cmd
 }
 
+
 # Generates zabbix cfg from control file
 # $1 control
 # $2 pluginname
@@ -113,6 +132,7 @@ zaf_ctrl_generate_cfg() {
 	local iscript
 	local ikey
 	local lock
+	local cache
 
 	items=$(zaf_ctrl_get_items <"$1")
 	for i in $items; do
@@ -133,21 +153,25 @@ zaf_ctrl_generate_cfg() {
 	    if [ -n "$lock" ]; then
 		lock="${ZAF_LIB_DIR}/zaflock $lock "
 	    fi
+	    cache=$(zaf_ctrl_get_item_option $1 $i "Cache")
+	    if [ -n "$cache" ]; then
+		cache="_cache '$cache' "
+	    fi
             cmd=$(zaf_ctrl_get_item_option $1 $i "Cmd")
             if [ -n "$cmd" ]; then
-                $(which echo) "UserParameter=$ikey,${ZAF_LIB_DIR}/preload.sh $lock$cmd";
+                $(which echo) "UserParameter=$ikey,${ZAF_LIB_DIR}/preload.sh $cache $lock$cmd";
                 continue
             fi
             cmd=$(zaf_ctrl_get_item_option $1 $i "Function")
             if [ -n "$cmd" ]; then
-                $(which echo) "UserParameter=$ikey,${ZAF_LIB_DIR}/preload.sh $lock$cmd";
+                $(which echo) "UserParameter=$ikey,${ZAF_LIB_DIR}/preload.sh $cache $lock$cmd";
                 continue;
             fi
             cmd=$(zaf_ctrl_get_item_option $1 $i "Script")
             if [ -n "$cmd" ]; then
                 zaf_ctrl_get_item_option $1 $i "Script" >${ZAF_TMP_DIR}/${iscript}.sh;
                 zaf_install_bin ${ZAF_TMP_DIR}/${iscript}.sh ${ZAF_PLUGINS_DIR}/$2/
-                $(which echo) "UserParameter=$ikey,${ZAF_LIB_DIR}/preload.sh $lock${ZAF_PLUGINS_DIR}/$2/${iscript}.sh $args";
+                $(which echo) "UserParameter=$ikey,${ZAF_LIB_DIR}/preload.sh $cache $lock${ZAF_PLUGINS_DIR}/$2/${iscript}.sh $args";
                 continue;
             fi
 	    zaf_err "Item $i declared in control file but has no Cmd, Function or Script!"
diff --git a/lib/preload.sh b/lib/preload.sh
index 641616a..fefde66 100644
--- a/lib/preload.sh
+++ b/lib/preload.sh
@@ -4,19 +4,33 @@
 
 [ -z "$ZAF_TMP_BASE" ] && ZAF_TMP_BASE=/tmp/zaf
 ZAF_TMP_DIR="${ZAF_TMP_BASE}-${USER}"
-trap "rm -rif ${ZAF_TMP_DIR}" EXIT
+[ -z "$ZAF_CACHE_DIR" ] && ZAF_CACHE_DIR=${ZAF_TMP_BASE}-${USER}c
+
+#trap "rm -rif ${ZAF_TMP_DIR}" EXIT
 ! [ -d "${ZAF_TMP_DIR}" ] && mkdir "${ZAF_TMP_DIR}"
+! [ -d "${ZAF_CACHE_DIR}" ] && mkdir "${ZAF_CACHE_DIR}"
 [ -z "$ZAF_DEBUG" ] && ZAF_DEBUG=1
 
 . ${ZAF_LIB_DIR}/zaf.lib.sh
 . ${ZAF_LIB_DIR}/ctrl.lib.sh
 . ${ZAF_LIB_DIR}/os.lib.sh
+. ${ZAF_LIB_DIR}/zbxapi.lib.sh
+. ${ZAF_LIB_DIR}/cache.lib.sh
 
 export ZAF_LIB_DIR
 export ZAF_TMP_DIR
 export ZAF_PLUGINS_DIR
 
-[ "$(basename $0)" = "preload.sh" ] && [ -n "$*" ] && $@
-
+if [ "$1" = "_cache" ]; then
+	shift
+	seconds=$1
+	shift
+	parms=$(echo $*|tr -d ' ')
+	if ! zaf_fromcache $parms; then
+		([ "$(basename $0)" = "preload.sh" ] && [ -n "$*" ] && $@ ) | zaf_tocache_stdin $parms $seconds
+	fi
+else
+	[ "$(basename $0)" = "preload.sh" ] && [ -n "$*" ] && $@
+fi
 
 
diff --git a/lib/zaf.lib.sh b/lib/zaf.lib.sh
index acf7a4d..5294cc0 100644
--- a/lib/zaf.lib.sh
+++ b/lib/zaf.lib.sh
@@ -73,6 +73,27 @@ zaf_far(){
    eval $sedcmd
 }
 
+# Limit concurrent processes or continue
+zaf_bglimit(){
+    local maxbg
+    local maxnumber
+    local cnumber
+    if [ $# -eq 0 ] ; then
+            maxbg=5
+    else
+	    maxbg=$1
+    fi
+    maxnumber=$((0 + ${1:-0}))
+    while true; do
+            cnumber=$(jobs | wc -l)
+            if [ $cnumber -lt $maxnumber ]; then
+                    break
+            fi
+	    zaf_dbg "Limiting next job due to $maxbg limit of bg jobs"
+            sleep 1
+    done
+}
+
 # Initialises discovery function
 zaf_discovery_begin(){
 cat <<EOF
@@ -251,6 +272,7 @@ zaf_install_plugin() {
 			[ "$ZAF_DEBUG" -gt 1 ] && zaf_plugin_info "${control}"
 			zaf_ctrl_check_deps "${control}"
 			zaf_ctrl_install "$url" "${control}" "${plugindir}"
+			zaf_ctrl_sudo "$plugin" "${control}" "${plugindir}"
 			zaf_ctrl_generate_cfg "${control}" "${plugin}" \
 			  | zaf_far '{PLUGINDIR}' "${plugindir}" >${ZAF_AGENT_CONFIGD}/zaf_${plugin}.conf
 			zaf_dbg "Generated ${ZAF_AGENT_CONFIGD}/zaf_${plugin}.conf"
diff --git a/lib/zbxapi.lib.sh b/lib/zbxapi.lib.sh
index be30bbb..24a6b5e 100644
--- a/lib/zbxapi.lib.sh
+++ b/lib/zbxapi.lib.sh
@@ -3,10 +3,14 @@
 zaf_zbxapi_do() {
 	local result
 	if ! zaf_fromcache "$1"; then
-		zaf_dbg "Zabbix API: $1"
+		zaf_trc "Zabbix API: $1"
 		result=$(curl -s -f -L -X POST -H 'Content-Type: application/json-rpc' -d "$1" "$ZAF_ZBXAPI_URL")
-		zaf_tocache "$1" "$result" 60
-		echo $result
+		if [ $? = 0 ] && echo $result | grep -q '"result":'; then
+			zaf_tocache "$1" "$result" 60		
+			echo $result
+		else
+			zaf_err "Error processing API request. ($?,$result)"
+		fi
 	fi
 }
 
@@ -55,7 +59,6 @@ zaf_zbxapi_login(){
     ZAF_ZBXAPI_URL=$(echo $ZAF_ZBXAPI_URL | cut -d '/' -f 1)//$ZAF_ZBXAPI_USER:$ZAF_ZBXAPI_PASS@$(echo $ZAF_ZBXAPI_URL | cut -d '/' -f 3-)
  fi
  result=$(zaf_zbxapi_do "$authstr")
- echo $result | grep -vq '"result":"' && zaf_err "Cannot login to API"
  ZAF_ZBXAPI_AUTH=$(echo $result |zaf_zbxapi_getresult| zaf_zbxapi_getstring)
  zaf_dbg "Logged into zabbix API ($ZAF_ZBXAPI_AUTH)"
 }
diff --git a/zaf b/zaf
index 3ea1a22..11c289f 100755
--- a/zaf
+++ b/zaf
@@ -18,6 +18,8 @@ done
 
 [ -z "$ZAF_TMP_BASE" ] && ZAF_TMP_BASE=/tmp/zaf
 ZAF_TMP_DIR="${ZAF_TMP_BASE}-${USER}"
+[ -z "$ZAF_CACHE_DIR" ] && ZAF_CACHE_DIR=${ZAF_TMP_BASE}-${USER}c
+
 [ -z "$ZAF_DEBUG" ] && ZAF_DEBUG=1
 export ZAF_DEBUG
 
@@ -70,6 +72,28 @@ check-agent-config)
 	zaf_check_agent_config
 	;;
 
+cache-clean)
+	zaf_cache_clean
+	;;
+
+userparms)
+	for plugin in $(zaf_list_plugins); do
+		plugindir=$ZAF_PLUGINS_DIR/$plugin
+		control=$plugindir/control.zaf
+		zaf_ctrl_generate_cfg "${control}" "${plugin}" \
+			  | zaf_far '{PLUGINDIR}' "${plugindir}"
+	done
+	;;
+
+agent-config)
+	for plugin in $(zaf_list_plugins); do
+		plugindir=$ZAF_PLUGINS_DIR/$plugin
+		control=$plugindir/control.zaf
+		zaf_ctrl_generate_cfg "${control}" "${plugin}" \
+			  | zaf_far '{PLUGINDIR}' "${plugindir}" >${ZAF_AGENT_CONFIGD}/zaf_${plugin}.conf
+	done
+	;;
+
 update)
 	zaf_wrn "Updating repository ${ZAF_REPO_GITURL}..."
 	zaf_update_repo
@@ -241,17 +265,29 @@ api)
 		zaf_zbxapi_gethostsingroup $gid
 		;;
 	backup-group)
-		gid=$(zaf_zbxapi_gethostgroupid "$3")
+	set -e
+		shift $(zaf_shift)
+		shift; shift
+		gid=$(zaf_zbxapi_gethostgroupid "$1")
+		shift $(zaf_shift)
+		shift
 		hosts=$(zaf_zbxapi_gethostsingroup $gid)
+		dir="."
+		[ -n "$1" ] && dir="$1"
 		zaf_wrn "Will backup this hosts: $hosts"
+		zaf_wrn "Output dir: $dir"
 		for h in $hosts; do
-			hn=$(zaf_zbxapi_gethost $h)
+			zaf_bglimit 5
+			(hn=$(zaf_zbxapi_gethost $h)
 			zaf_wrn "Exporting host $hn($h)..."
-			zaf_zbxapi_backuphost $h >$hn.xml
+			zaf_zbxapi_backuphost $h >$dir/$hn.xml )
 		done
+		wait
 		;;
 	backup-host)
-		hostid=$(zaf_zbxapi_gethostid "$3")
+		shift $(zaf_shift)
+		shift; shift
+		hostid=$(zaf_zbxapi_gethostid "$1")
 		zaf_wrn "Exporting host $3($hostid)..."
 		zaf_zbxapi_backuphost $hostid
 		;;
@@ -283,8 +319,12 @@ api)
 	echo "$0 install plugin		To install plugin"
 	echo "$0 remove plugin		To remove plugin" 
 	echo "$0 api			To zabbix API functions. See $0 api for more info."
+	echo "$0 userparms		See userparms generated from zaf on stdout"
+	echo "$0 agent-config		Reconfigure zabbix userparms in $ZAF_AGENT_CONFIGD"
+
 	echo "$0 self-upgrade		To self-upgrade zaf"
 	echo "$0 self-remove		To self-remove zaf and its config"
+	echo "$0 cache-clean		To remove all entries from cache"
 	echo
 	;;