diff --git a/src/env.sh b/src/env.sh
index 30b2a17..361f691 100644
--- a/src/env.sh
+++ b/src/env.sh
@@ -1,5 +1,8 @@
 #!/bin/sh
 
+_OUTPUT=/dev/stdin
+[ "$_ZPKG_SELF_UPGRADE" = "y" ] && _OUTPUT=/dev/null
+
 config_path=/etc/zpkg
 fname="$(basename "$0")"
 ALLOW_ROOT=false
diff --git a/src/main.sh b/src/main.sh
index 9bdaa77..3c464f4 100644
--- a/src/main.sh
+++ b/src/main.sh
@@ -55,7 +55,7 @@ info)
   fi
   ;;
 install)
-  fetch_pkglist $sudo || exit $?
+  fetch_pkglist $sudo > $_OUTPUT || exit $?
   if [ -z "$2" ]
   then
     echo "No package specified" >&2
@@ -63,7 +63,7 @@ install)
     shift 1
     pkglist=$(LOG=true resolve_packages $*) || exit $?
     pkglist=$(INCLUDE_PACKAGES=true resolve_deps $* | tr '\n' ' ')
-    echo "Installing packages: $pkglist"
+    echo "Installing packages: $pkglist" > $_OUTPUT
     for I in $pkglist
     do
       if is_installed $I
@@ -133,4 +133,4 @@ deploy)
 *) usage && exit 1 ;;
 esac
 
-[ -n "$_self_update" ] && gen_self_update && exec "$_tmpzpkg" -R install zpkg
+[ -n "$_self_update" ] && gen_self_update && _ZPKG_SELF_UPGRADE=y exec "$_tmpzpkg" -R install zpkg
diff --git a/src/upgrade.sh b/src/upgrade.sh
index ffb0678..539fb26 100644
--- a/src/upgrade.sh
+++ b/src/upgrade.sh
@@ -41,9 +41,9 @@ upgrade_package()
 ## self upgrading mitigation
 
 unset _self_update
-_tmpzpkg="/tmp/zpkg_bin_$(random_string 5)"
 gen_self_update()
 {
+  _tmpzpkg="/tmp/zpkg_bin_$(random_string 5)"
   # copy current file
   cp "$0" "$_tmpzpkg" || return $?
   # make new script self-delete