diff --git a/install.sh b/install.sh
index b86a913..0e74e80 100755
--- a/install.sh
+++ b/install.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 [ -z "$ZAF_DEBUG" ] && ZAF_DEBUG=1
+export ZAF_LOG_STDERR="-s"
 if [ -z "$ZAF_URL" ]; then
 	# Runing as standalone install.sh. We have to download rest of files first.
 	ZAF_URL="https://github.com/limosek/zaf/"
@@ -8,20 +9,28 @@ fi
 
 [ -z "$ZAF_GITBRANCH" ] && ZAF_GITBRANCH=1.2
 
+ZAF_TMP_DIR="/tmp/zaf-installer"
+ZAF_DIR="$ZAF_TMP_DIR/zaf"
+
 # Lite version of zaf_fetch_url, full version will be loaded later
 zaf_fetch_url(){
-	if [ -z "$ZAF_OFFLINE" ]; then
-		echo  curl -f -k -s -L -o - "$1" >&2; curl -f -k -s -L -o - "$1"
-	else
-		echo "Offline mode wants to download $1. Exiting." >&2
-		exit 2
-	fi
+	echo  curl -f -k -s -L -o - "$1" >&2;
+	curl -f -k -s -L -o - "$1"
 }
 
-# Download tgz and extract to /tmp/zaf-installer
+# Lite version of zaf_err, full version will be loaded later
+zaf_err() {
+	logger ${ZAF_LOG_STDERR} -p user.err -t zaf-error -- $@
+        logger ${ZAF_LOG_STDERR} -p user.err -t zaf-error "Exiting with error!"
+        exit 1
+}
+
+# Download tgz and extract to tmpdir
 zaf_download_files() {
-	rm -rf /tmp/zaf-installer
-	zaf_fetch_url $ZAF_URL/archive/$ZAF_GITBRANCH.tar.gz | tar -f - -C /tmp -zx && mv /tmp/zaf-$ZAF_GITBRANCH /tmp/zaf-installer
+	[ -n $ZAF_DIR ] && zaf_err "ZAF_DIR not set!"
+	rm -rf $ZAF_DIR
+	zaf_fetch_url $ZAF_URL/archive/$ZAF_GITBRANCH.tar.gz | tar -f - -C $ZAF_TMP_DIR -zx && mv $ZAF_TMP_DIR/zaf-$ZAF_GITBRANCH $ZAF_DIR \
+ 		|| zaf_err "Cannot download and unpack zaf!"
 }
 
 if ! [ -f README.md ]; then
@@ -32,7 +41,7 @@ if ! [ -f README.md ]; then
 	fi
 	echo "Installing from url $url..."
 	[ -z "$*" ] && auto=auto
-	zaf_download_files && cd /tmp/zaf-installer && exec ./install.sh $auto "$@"
+	zaf_download_files && cd $ZAF_DIR && exec ./install.sh $auto "$@"
 	echo "Error downloading and runing installer!" >&2
 	exit 2
 fi
@@ -276,7 +285,7 @@ zaf_configure(){
 }
 
 zaf_install_all() {
-	rm -rif ${ZAF_TMP_DIR}
+	rm -rf ${ZAF_TMP_DIR}
 	mkdir -p ${ZAF_TMP_DIR}
 	zaf_install_dir ${ZAF_LIB_DIR}
 	for i in lib/zaf.lib.sh lib/plugin.lib.sh lib/os.lib.sh lib/ctrl.lib.sh lib/cache.lib.sh lib/zbxapi.lib.sh lib/JSON.sh README.md; do
@@ -317,14 +326,15 @@ zaf_postconfigure() {
 if [ -f "${ZAF_CFG_FILE}" ]; then
 	. "${ZAF_CFG_FILE}"
 fi
-ZAF_TMP_DIR="/tmp/zaf-installer-tmp/"
+ZAF_TMP_DIR="/tmp/zaf-installer/"
+! [ -d "${ZAF_TMP_DIR}" ] && mkdir "${ZAF_TMP_DIR}"
 
 # If debug is on, do not remove tmp dir 
 if [ "$ZAF_DEBUG" -le 3 ]; then
-	trap "rm -rif ${ZAF_TMP_DIR}" EXIT
-	trap "rm -rif /tmp/zaf-installer" EXIT
+	trap "rm -rf ${ZAF_TMP_DIR} " EXIT
+else
+	trap 'zaf_wrn "Leaving $ZAF_TMP_DIR" contents due to ZAF_DEBUG.' EXIT
 fi
-! [ -d "${ZAF_TMP_DIR}" ] && mkdir "${ZAF_TMP_DIR}"
 
 case $1 in
 interactive)
diff --git a/lib/cache.lib.sh b/lib/cache.lib.sh
index 0cc3285..9a7c985 100644
--- a/lib/cache.lib.sh
+++ b/lib/cache.lib.sh
@@ -9,7 +9,7 @@ zaf_cache_clean(){
 	fi
 	mkdir -p "$ZAF_CACHE_DIR"
 	if zaf_is_root; then
-		chmod g+rwx "$ZAF_CACHE_DIR"
+		chmod 770 "$ZAF_CACHE_DIR"
 		chgrp zabbix "$ZAF_CACHE_DIR"
 	fi
 }
@@ -86,6 +86,7 @@ zaf_fromcache(){
 	local value
 	key=$(zaf_cache_key "$1")
 	if [ -f $ZAF_CACHE_DIR/$key ]; then
+		! [ -f "$ZAF_CACHE_DIR/$key.info" ] && { return 3; }
 		if [ "$ZAF_CACHE_DIR/$key.info" -nt "$ZAF_CACHE_DIR/$key" ]; then
 			zaf_trc "Cache: serving $1($key) from cache"
 			cat $ZAF_CACHE_DIR/$key
diff --git a/lib/ctrl.lib.sh b/lib/ctrl.lib.sh
index 275bd20..3790e8e 100644
--- a/lib/ctrl.lib.sh
+++ b/lib/ctrl.lib.sh
@@ -191,20 +191,28 @@ zaf_ctrl_generate_cfg() {
 	local ikey
 	local lock
 	local cache
+	local tmpfile
+	local pname
+	local pdefault
+	local pregex
+	local prest
+	local zafparms
 
 	items=$(zaf_ctrl_get_items <"$1")
+	tmpfile=$ZAF_TMP_DIR/gencfg$$
 	(set -e
 	for i in $items; do
             iscript=$(zaf_stripctrl $i)
-	    params=$(zaf_ctrl_get_item_option $1 $i "Parameters")
-	    if [ -n "$params" ]; then
+	    zaf_ctrl_get_item_option $1 $i "Parameters" >$tmpfile
+	    if [ -s "$tmpfile" ]; then
 		ikey="$2.$i[*]"
 		args=""
 		apos=1;
-		for p in $params; do
+		while read pname pdefault pregex prest; do
+			zafparams="$zafparams value=\"\$$apos\"; zaf_agentparm $pname $pdefault $pregex;"
 			args="$args \$$apos"
 			apos=$(expr $apos + 1)
-		done
+		done <$tmpfile
 	    else
 		ikey="$2.$i"
 	    fi
@@ -223,16 +231,18 @@ zaf_ctrl_generate_cfg() {
 		preload=""
 	    fi
             if [ -n "$cmd" ]; then
-                printf "%s" "UserParameter=$ikey,${preload}${cache}${lock}${cmd}"; echo
+                printf "%s" "UserParameter=$ikey,export ITEM_KEY='$ikey'; ${preload}${cache}${lock}${cmd}"; echo
                 continue
             fi
             cmd=$(zaf_ctrl_get_item_option $1 $i "Script")
             if [ -n "$cmd" ]; then
-                zaf_ctrl_get_item_option $1 $i "Script" | \
-		  zaf_far '{INCLUDES}' ". $ZAF_LIB_DIR/preload.sh; " \
-		  >${ZAF_TMP_DIR}/${iscript}.sh;
+                ( echo "#!/bin/sh"
+		  echo ". $ZAF_LIB_DIR/preload.sh; "
+		  echo "$zafparams"
+		  zaf_ctrl_get_item_option $1 $i "Script"
+		  ) >${ZAF_TMP_DIR}/${iscript}.sh;
                 [ -z "$3" ] && zaf_install_bin ${ZAF_TMP_DIR}/${iscript}.sh ${ZAF_PLUGINS_DIR}/$2/
-                printf "%s" "UserParameter=$ikey,${preload}${cache}${lock}${ZAF_PLUGINS_DIR}/$2/${iscript}.sh $args"; echo
+                printf "%s" "UserParameter=$ikey,export ITEM_KEY='$ikey'; ${preload}${cache}${lock}${ZAF_PLUGINS_DIR}/$2/${iscript}.sh $args"; echo
                 continue;
             fi
 	    zaf_err "Item $i declared in control file but has no Cmd, Function or Script!"
diff --git a/lib/plugin.lib.sh b/lib/plugin.lib.sh
index 112335e..90ad655 100644
--- a/lib/plugin.lib.sh
+++ b/lib/plugin.lib.sh
@@ -218,6 +218,30 @@ zaf_list_plugin_items() {
 	echo
 }
 
+zaf_item_info() {
+	local plugin
+	local item
+
+	plugin=$(echo $1 | cut -d '.' -f 1)
+	item=$(echo $1 | cut -d '.' -f 2-)
+	if zaf_is_plugin $plugin; then
+		if zaf_ctrl_get_items <$ZAF_PLUGINS_DIR/$plugin/control.zaf | grep -wq "$item"; then
+			echo "Item $1:"
+			echo -n "Cache: "; zaf_ctrl_get_item_option $ZAF_PLUGINS_DIR/$plugin/control.zaf "$item" "Cache"; echo
+			echo "Parameters:"
+			zaf_ctrl_get_item_option $ZAF_PLUGINS_DIR/$plugin/control.zaf "$item" "Parameters" ; echo
+			echo "Testparameters:"
+			zaf_ctrl_get_item_option $ZAF_PLUGINS_DIR/$plugin/control.zaf "$item" "Testparameters" ; echo
+			echo "Precache:"
+			zaf_ctrl_get_item_option $ZAF_PLUGINS_DIR/$plugin/control.zaf "$item" "Precache" ; echo
+		else
+			zaf_err "No such item $item."
+		fi	
+	else
+		zaf_err "No such plugin $plugin."
+	fi
+}
+
 zaf_list_items() {
 	for p in $(zaf_list_plugins); do
 		echo $p: $(zaf_list_plugin_items $p)
@@ -226,7 +250,7 @@ zaf_list_items() {
 
 zaf_get_item() {
 	if which zabbix_get >/dev/null; then
-		zaf_dbg zabbix_get -s localhost -k "'$1'"
+		zaf_trc zabbix_get -s localhost -k "'$1'"
 		(zabbix_get -s localhost -k "$1" | tr '\n' ' '; echo) || zaf_wrn "Cannot reach agent on localhost. Please localhost to Server list."
 		return 11
 	else
@@ -236,6 +260,7 @@ zaf_get_item() {
 }
 
 zaf_test_item() {
+	zaf_trc $ZAF_AGENT_BIN -t "'$1'"
 	if $ZAF_AGENT_BIN -t "$1" | grep ZBX_NOTSUPPORTED; then
 		return 1
 	else
diff --git a/lib/preload.sh b/lib/preload.sh
index ec182cf..d638215 100644
--- a/lib/preload.sh
+++ b/lib/preload.sh
@@ -2,27 +2,46 @@
 
 . /etc/zaf.conf
 
-[ -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}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}/plugin.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
 
+[ -z "$ZAF_TMP_BASE" ] && ZAF_TMP_BASE=/tmp/zaf
+[ -z "$ZAF_TMP_DIR" ] && ZAF_TMP_DIR="${ZAF_TMP_BASE}-$(zaf_random)"
+[ -z "$ZAF_CACHE_DIR" ] && ZAF_CACHE_DIR=${ZAF_TMP_BASE}c
+
+rm -rf "${ZAF_TMP_DIR}"
+
+if ! [ -d "${ZAF_TMP_DIR}" ]; then
+	mkdir "${ZAF_TMP_DIR}"
+fi
+
+! [ -d "${ZAF_CACHE_DIR}" ] && mkdir "${ZAF_CACHE_DIR}"
+[ -z "$ZAF_DEBUG" ] && ZAF_DEBUG=1
+
+if [ "$ZAF_DEBUG" -le 3 ]; then
+	trap "rm -rf ${ZAF_TMP_DIR}" EXIT
+else
+	trap 'zaf_wrn "Leaving $ZAF_TMP_DIR" contents due to ZAF_DEBUG.' EXIT
+fi
+
+#trap 'touch /tmp/aaaa' ALARM
+
 export ZAF_LIB_DIR
 export ZAF_TMP_DIR
 export ZAF_CACHE_DIR
 export ZAF_PLUGINS_DIR
+export ZAF_DEBUG
+unset ZAF_LOG_STDERR
+export PATH=$ZAF_LIB_DIR:$ZAF_BIN_DIR:$PATH
 
-[ "$(basename $0)" = "preload.sh" ] && [ -n "$*" ] && $@
-
+if [ "$(basename $0)" = "preload.sh" ] && [ -n "$*" ]; then
+	tmpf=$(zaf_tmpfile preload)
+	$@ 2>$tmpf
+	[ -s $tmpf ] && zaf_wrn <$tmpf
+fi
 
 
diff --git a/lib/zaf.lib.sh b/lib/zaf.lib.sh
index 1856134..19566db 100644
--- a/lib/zaf.lib.sh
+++ b/lib/zaf.lib.sh
@@ -11,17 +11,17 @@ zaf_msg() {
 	echo $@
 }
 zaf_trc() {
-	[ "$ZAF_DEBUG" -ge "3" ] && logger -p user.info -s -t zaf-trace -- $@
+	[ "$ZAF_DEBUG" -ge "3" ] && logger -p user.info ${ZAF_LOG_STDERR} -t zaf-trace -- $@
 }
 zaf_dbg() {
-	[ "$ZAF_DEBUG" -ge "2" ] && logger -p user.debug -s -t zaf-debug -- $@
+	[ "$ZAF_DEBUG" -ge "2" ] && logger -p user.debug ${ZAF_LOG_STDERR} -t zaf-debug -- $@
 }
 zaf_wrn() {
-	[ "$ZAF_DEBUG" -ge "1" ] && logger -p user.warn -s -t zaf-warning -- $@
+	[ "$ZAF_DEBUG" -ge "1" ] && logger -p user.warn ${ZAF_LOG_STDERR} -t zaf-warning -- $@
 }
 zaf_err() {
-	logger -s -p user.err -t zaf-error -- $@
-        logger -s -p user.err -t zaf-error "Exiting with error!"
+	logger ${ZAF_LOG_STDERR} -p user.err -t zaf-error -- $@
+        logger ${ZAF_LOG_STDERR} -p user.err -t zaf-error "Exiting with error!"
         exit 1
 }
 # Help option
@@ -43,6 +43,31 @@ zaf_version(){
 	echo $ZAF_VERSION
 }
 
+# Add parameter for agent check
+# $1 parameter name (will be set to var)
+# $2 if nonempty, it is default value. If empty, parameter is mandatory
+# $3 if nonempty, regexp to test
+zaf_agentparm(){
+	local name
+	local default
+	local regexp
+
+	name="$1"
+	default="$2"
+	regexp="$3"
+	
+	[ -z "$value" ] && [ -z "$default" ] && zaf_err "$ITEM_KEY: Missing mandatory parameter $name."
+	if [ -z "$value" ]; then
+		value="$default"
+	else
+		if [ -n "$regexp" ]; then
+			echo "$value" | grep -qE "$regexp" ||  zaf_err "$ITEM_KEY: Bad parameter '$name' value '$value' (not in regexp '$regexp')."
+		fi
+	fi
+	eval $name=$value
+	zaf_trc "$ITEM_KEY: Param $name set to $value"
+}
+
 # Fetch url to stdout 
 # $1 url
 # It supports real file, file:// and other schemes known by curl
@@ -211,3 +236,14 @@ zaf_date_add() {
 	date -d "$1 seconds" "+%Y-%m-%d %H:%M:%S" 2>/dev/null || date -d "$(expr $(date +%s) + $1)" -D %s "+%Y-%m-%d %H:%M:%S"
 }
 
+# Create temp file and return its name
+# $1 prefix or empty
+zaf_tmpfile() {
+	echo "$ZAF_TMP_DIR/tmp$1"
+}
+
+# return random number
+zaf_random() {
+	hexdump -n 2 -e '/2 "%u"' /dev/urandom
+}
+
diff --git a/lib/zafcache b/lib/zafcache
index 0a98c2d..3fc3c24 100644
--- a/lib/zafcache
+++ b/lib/zafcache
@@ -10,8 +10,25 @@ seconds=$1
 shift
 [ -z "$*" ] && help
 
-parms=$(echo $*|tr -d ' ')
-if ! zaf_fromcache "$parms"; then
-	$@ | zaf_tocache_stdin "$parms" "$seconds"
+zaf_trc "zafcache($seconds): $ITEM_KEY,'$2' '$3' '$4' '$5' '$6' '$7' '$8' '$9'"
+
+if [ -z "$ITEM_KEY" ]; then
+	key=$(echo $*|tr ' ' '_')
+else
+	key="$(echo ${ITEM_KEY}|cut -d '[' -f 1)[$(shift; echo $*|tr ' ' ',')]"
+fi
+
+if ! zaf_fromcache "$key"; then
+	zaf_fromcache "$key" >/dev/null 2>/dev/null
+	[ $? -eq 3 ] && { zaf_err "Operation $key already in progress."; }
+	if which at >/dev/null 2>/dev/null; then
+		at -M now >/dev/null 2>/dev/null <<EOF
+		. $(dirname $0)/preload.sh; tmpf=\$(zaf_tmpfile cache); $@ 2>"\$tmpf" | zaf_tocache_stdin "$key" "$seconds" ; [ -s \$tmpf ] && zaf_wrn <\$tmpf
+EOF
+	else
+		tmpf=$(zaf_tmpfile cache)
+		$@ 2>"$tmpf" | zaf_tocache_stdin "$key" "$seconds" 
+		[ -s $tmpf ] && zaf_wrn <$tmpf
+	fi
 fi
 
diff --git a/lib/zaflock b/lib/zaflock
index a983f94..04d3575 100644
--- a/lib/zaflock
+++ b/lib/zaflock
@@ -13,7 +13,7 @@ shift
 [ -z "${ZAF_LOCK_SECONDS}" ] && seconds=5
 [ -z "${ZAF_LOCK_FORCE}" ] && force=1
 
-lockfile="${ZAF_TMP_DIR}/zaflock_${lkey}"
+lockfile="/tmp/zaflock_${lkey}"
 i=0
 while [ -f "$lockfile" ] && [ $i -lt $seconds ]; do
 	sleep 1
@@ -28,7 +28,6 @@ if [ -f "$lockfile" ] && [ -z "$force" ]; then
 	exit 1
 fi
 
-touch "$lockfile"
-[ -n "$*" ] && $@
-rm -f "$lockfile"
+[ -n "$*" ] && $@ 2>"$lockfile"
+[ -s "$lockfile" ] && zaf_wrn <"$lockfile"
 
diff --git a/zaf b/zaf
index e1cb691..350a56a 100755
--- a/zaf
+++ b/zaf
@@ -25,23 +25,6 @@ ZAF_CFG_FILE="/etc/zaf.conf"
 	[ -n "$secondstage" ] && exec $0 $params
 fi
 
-[ -z "$ZAF_TMP_BASE" ] && ZAF_TMP_BASE=/tmp/zaf
-ZAF_TMP_DIR="${ZAF_TMP_BASE}-${USER}"
-[ -z "$ZAF_CACHE_DIR" ] && ZAF_CACHE_DIR=${ZAF_TMP_BASE}c
-
-[ -z "$ZAF_DEBUG" ] && ZAF_DEBUG=1
-export ZAF_DEBUG
-
-# If debug is on, do not remove tmp dir 
-if [ "$ZAF_DEBUG" -le 3 ]; then
-	trap "rm -rif ${ZAF_TMP_DIR}" EXIT
-fi
-
-! [ -d "${ZAF_TMP_DIR}" ] && mkdir "${ZAF_TMP_DIR}"
-if ! [ -d "${ZAF_CACHE_DIR}" ]; then
-	mkdir "${ZAF_CACHE_DIR}"
-fi
-
 if [ -f ./lib/zaf.lib.sh ]; then
 . ./lib/zaf.lib.sh
 . ./lib/plugin.lib.sh
@@ -60,6 +43,26 @@ else
 [ -f ${ZAF_LIB_DIR}/zaf.${ZAF_OS}.sh ] && . ${ZAF_LIB_DIR}/zaf.${ZAF_OS}.sh
 fi
 
+[ -z "$ZAF_TMP_BASE" ] && ZAF_TMP_BASE=/tmp/zaf
+ZAF_TMP_DIR="${ZAF_TMP_BASE}-$(zaf_random)"
+[ -z "$ZAF_CACHE_DIR" ] && ZAF_CACHE_DIR=${ZAF_TMP_BASE}c
+
+[ -z "$ZAF_DEBUG" ] && ZAF_DEBUG=1
+export ZAF_DEBUG
+export ZAF_LOG_STDERR="-s"
+
+# If debug is on, do not remove tmp dir 
+if [ "$ZAF_DEBUG" -le 3 ]; then
+	trap "rm -rf ${ZAF_TMP_DIR}" EXIT
+else
+	trap 'zaf_wrn "Leaving $ZAF_TMP_DIR" contents due to ZAF_DEBUG.' EXIT
+fi
+
+! [ -d "${ZAF_TMP_DIR}" ] && mkdir "${ZAF_TMP_DIR}"
+if ! [ -d "${ZAF_CACHE_DIR}" ]; then
+	mkdir "${ZAF_CACHE_DIR}"
+fi
+
 if zaf_is_root; then
 	chgrp zabbix "${ZAF_CACHE_DIR}"
 	chmod g+w "${ZAF_CACHE_DIR}"
@@ -115,15 +118,19 @@ show)
 			zaf_plugin_info $ZAF_PLUGINS_DIR/$plugin/control.zaf
 		done
 	else
-		if zaf_list_plugins | grep -q "^$1"; then
-			[ -f $ZAF_PLUGINS_DIR/$1/control.zaf ] && zaf_plugin_info $ZAF_PLUGINS_DIR/$1/control.zaf || zaf_err "Plugin $1 not installed."
-		else
-			if echo $1 |grep -q ^http; then
-				zaf_prepare_plugin "$1" "$ZAF_TMP_DIR/plugin"
-				zaf_plugin_info "$ZAF_TMP_DIR/plugin/control.zaf"
+		if echo $1 | grep -vq "\."; then
+			if zaf_list_plugins | grep -q "^$1"; then
+				zaf_is_plugin $1 && zaf_plugin_info $ZAF_PLUGINS_DIR/$1/control.zaf || zaf_err "Plugin $1 not installed."
 			else
-				zaf_err "Plugin $1 not installed."
+				if echo $1 |grep -q ^http; then
+					zaf_prepare_plugin "$1" "$ZAF_TMP_DIR/plugin"
+					zaf_plugin_info "$ZAF_TMP_DIR/plugin/control.zaf"
+				else
+					zaf_err "Plugin $1 not installed."
+				fi
 			fi
+		else
+			zaf_item_info "$1"
 		fi
 	fi
 	;;
@@ -153,7 +160,7 @@ test)
 	for p in $plugins; do
 		! zaf_is_plugin $p && zaf_err "Unknown plugin $p"
 		for i in $(zaf_list_plugin_items $p test); do 
-			echo $i: $(zaf_test_item $i)
+			zaf_test_item $i
 			echo
 		done
 	done