Fix bugs and improve output UI

- Fix hosts file existence check (was always false)
- Fix loop to use while+read to handle spaces in hostnames
- Filter empty lines from hosts file
- Fix error exits to use exit 1
- Show progress counter [n/total] per host
- Compact single-line output with colors
- Show [DRY RUN] prefix when -d is set
- Show per-host exit status (✓ ok / ✗ failed)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

csc

@@ -81,20 +81,20 @@ fi
 
 if [ -z "$group" ]
 then
-    echo "Error: group is not defined !"
+    echo "Error: group is not defined!"
     echo
     usage
-    exit
+    exit 1
 fi
 
 hosts="$confdir/$group"
 
-if [ -z "$hosts" ]
+if [ ! -f "$hosts" ]
 then
-    echo "Error: hosts file $confdir/$group do not exists !"
+    echo "Error: hosts file $confdir/$group does not exist!"
     echo
     usage
-    exit
+    exit 1
 fi
 
 # see http://askubuntu.com/questions/506158/unable-to-initialize-frontend-dialog-when-using-ssh
@@ -105,24 +105,38 @@ FRONTEND="TERM=$TERM DEBIAN_FRONTEND=dialog"
 if [ "$verbose" = true ]
 then
     echo "> will do :"
-    echo "  grep -v '^ *#' < \"$hosts\" | while IFS= read -r line; do ssh -n -t \"\$line\" \"$FRONTEND $cmd\"; done"
+    echo "  grep -v '^ *#' \"$hosts\" | grep -v '^ *$' | while IFS= read -r line; do ssh -t \"\$line\" \"$FRONTEND $cmd\"; done"
 fi
 
-if [ "$dryRun" = false ]
-then
-    for line in $(grep -v '^#' "$hosts")
-    do
-		echo -e "\e[34m------------------------------------------------------------\e[0m"
-		echo -e "\e[34m> \e[32m\"$cmd\" \e[34mon \e[32m$line\e[0m"
-		echo -e "\e[34m> \e[33mssh -t \"$line\" \"$FRONTEND $cmd\"\e[0m"
-		echo -e "\e[34m------------------------------------------------------------\e[0m"
-		ssh -t "$line" "$FRONTEND $cmd"
-    done
-fi
+mapfile -t host_list < <(grep -v '^ *#' "$hosts" | grep -v '^ *$')
+total=${#host_list[@]}
+
+for i in "${!host_list[@]}"; do
+    line="${host_list[$i]}"
+    n=$((i + 1))
+
+    if [ "$dryRun" = true ]; then
+        prefix="\e[33m[DRY RUN]\e[0m "
+    else
+        prefix=""
+    fi
+
+    echo -e "${prefix}\e[34m[$n/$total]\e[0m \e[32m\"$cmd\"\e[0m \e[34mon\e[0m \e[32m$line\e[0m  \e[34m→\e[0m  \e[33mssh -t \"$line\" \"$FRONTEND $cmd\"\e[0m"
+
+    if [ "$dryRun" = false ]; then
+        ssh -t "$line" "$FRONTEND $cmd"
+        rc=$?
+        if [ $rc -eq 0 ]; then
+            echo -e "\e[32m✓ ok\e[0m"
+        else
+            echo -e "\e[31m✗ failed (exit $rc)\e[0m"
+        fi
+    fi
+done
 
 if [ "$verbose" = true ]
 then
-	echo "> All done, bye."
+    echo "> All done, bye."
 fi
 
-exit
+exit 0