diff --git a/.update.sh b/.update.sh
index 650ac88..2a207e0 100644
--- a/.update.sh
+++ b/.update.sh
@@ -12,7 +12,7 @@ cd $DOTFILES
 git fetch --all --prune
 if [[ -n "$(git status -s)" ]]; then
     fmt_error "directory not clean"
-    post_log "ERROR" "$THIS_FILE" "directory not clean"
+    post_beacon "dfs.dirty" 1>/dev/null &
     exit
 fi
 
@@ -25,6 +25,7 @@ case $DFS_UPDATE_CHANNEL in
 esac
 if [[ ${#DFS_COMMIT} != 40 ]]; then
     fmt_error "invalid commit id"
+    post_beacon "dfs.invalid-commit" 1>/dev/null &
     post_log "ERROR" "$THIS_FILE" "invalid commit id: ${DFS_COMMIT}"
     exit
 fi
@@ -35,7 +36,7 @@ if [[ "$(git rev-parse HEAD)" == "$DFS_COMMIT" ]]; then
 else
     fmt_info "checking out to commit $DFS_COMMIT ..."
     if [[ -z "$DFS_DEV" ]]; then
-        post_beacon "dfs-update"
+        post_beacon "dfs.updated" 1>/dev/null &
         git -c advice.detachedHead=false checkout $DFS_COMMIT
         cp ./.update.sh ./update.sh && chmod +x ./update.sh && exit $DFS_UPDATED_RET
     else
diff --git a/install.sh b/install.sh
index 479f5bf..74f7141 100755
--- a/install.sh
+++ b/install.sh
@@ -238,6 +238,7 @@ install(){
     install_crontab
     install_file_content
     install_symlink
+    post_beacon "dfs.installed" 1>/dev/null &
     # those that won't be uninstalled in the future
     install_tmux_tpm
     install_vim_vundle
@@ -254,6 +255,7 @@ uninstall(){
     uninstall_crontab
     uninstall_file_content
     uninstall_symlink
+    post_beacon "dfs.uninstalled" 1>/dev/null &
     fmt_note "done uninstalling!"
 }
 
diff --git a/tools/logger.sh b/tools/logger.sh
index 1986b1b..f7bb8b5 100755
--- a/tools/logger.sh
+++ b/tools/logger.sh
@@ -43,9 +43,13 @@ post_beacon()
     if [[ -z "$beacon_type" ]]; then
         fmt_fatal "beacon type is required"
     fi
-    exec 9>&1
-    resp=$(curl -sSL -X POST "https://api.beardic.cn/post-beacon?hostname=$hostname&beacon=$beacon_type" | tee >(cat - >&9))
-    (grep -q "200" <<< "$resp") || fmt_fatal "error posting beacon"
+    resp=$(curl -sSL -X POST "https://api.beardic.cn/post-beacon?hostname=$hostname&beacon=$beacon_type")
+    if grep -q "200" <<< "$resp"; then
+        echo $resp
+    else
+        echo $resp >&2
+        fmt_fatal "error posting beacon"
+    fi
 }
 
 post_log()
@@ -55,17 +59,18 @@ post_log()
         fmt_fatal "log content is required"
     fi
     init_uuid
-    exec 9>&1
-    resp=$(curl -sSL -X POST -H "Content-Type: text/plain" -d "$1" "https://api.beardic.cn/post-log?hostname=$hostname&uuid=$uuid" | tee >(cat - >&9))
-    if ! grep -q "200" <<< "$resp"; then
-        if grep -q "403" <<< "$resp"; then
-            fmt_error "error posting log: authentification failed"
-            fmt_info "try to register you hostname and uuid"
-            fmt_info "hostname: $hostname"
-            fmt_info "uuid: $uuid"
-        else
-            fmt_fatal "error posting log"
-        fi
+    resp=$(curl -sSL -X POST -H "Content-Type: text/plain" -d "$1" "https://api.beardic.cn/post-log?hostname=$hostname&uuid=$uuid")
+    if grep -q "200" <<< "$resp"; then
+        echo $resp
+    elif grep -q "403" <<< "$resp"; then
+        echo $resp >&2
+        fmt_error "error posting log: authentification failed"
+        fmt_info "try to register you hostname and uuid"
+        fmt_info "hostname: $hostname"
+        fmt_info "uuid: $uuid"
+    else
+        echo $resp >&2
+        fmt_fatal "error posting log"
     fi
 }
 
@@ -75,7 +80,7 @@ print_help()
 }
 
 if [[ $# != 2 ]]; then
-    print_help
+    print_help >&2
     exit 1
 fi