yt-dlp-ntfy: mention PID when already running

yt-dlp-ntfy.sh

@@ -1,23 +1,26 @@
 #!/bin/bash
-set -uexo pipefail
+set -ueo pipefail
 
 # Define PID file location
 PID_FILE="/tmp/yt-dlp-ntfy.pid"
 
 # Check if the script is already running
-if [ -e "$PID_FILE" ] && kill -0 $(cat "$PID_FILE"); then
-    echo "Script is already running. Exiting."
+if [ -e "$PID_FILE" ] && kill -0 $(cat "$PID_FILE") &>/dev/null; then
+    echo "Script is already running as PID $(cat $PID_FILE). Exiting."
     exit 1
 fi
 
 # Store the PID of the current process
 echo $$ > "$PID_FILE"
+echo "Running as PID $(cat $PID_FILE)"
 
 # Define ntfy server and channel
 NTFY_SERVER="https://notify.kucharczyk.xyz"
 CHANNEL="clipboard"
 ACCESS_TOKEN="$NTFY_ACCESS_TOKEN"
 
+echo "Monitoring channel $CHANNEL of server $NTFY_SERVER"
+
 # Run the script in an infinite loop to listen for new messages
 while true; do
 	while read -r message; do
@@ -29,8 +32,6 @@ while true; do
             echo "Downloading video from $video_url"
             yt-dlp "$video_url"
             curl -s -H "Authorization: Bearer $ACCESS_TOKEN" -d "Finished downloading." "$NTFY_SERVER/$CHANNEL"
-        else
-            echo "Received non-URL message: $video_url"
         fi
     done
 
@@ -40,5 +41,5 @@ while true; do
 done < <(curl --no-buffer -s -H "Authorization: Bearer $ACCESS_TOKEN" "$NTFY_SERVER/$CHANNEL/json")
 
 # Cleanup PID file on script exit
-trap "rm -f $PID_FILE" EXIT
+trap 'rm -f $PID_FILE' EXIT