added error checking and messages. The script will now notify the user of correct usage, handle dirty input as best it can, log curl and pushover errors.

notify.sh

@@ -1,8 +1,26 @@
 #!/bin/sh
 
-/usr/bin/curl -s \
+if [ "$#" -lt 2 ]; then
+  echo "Usage: notify.sh <title> <message>" >&2
+  exit 1
+fi
+
+title="$1"
+shift
+message="$*"
+
+output=$(/usr/bin/curl -s \
   --form-string "token=$PUSHOVER_TOKEN" \
   --form-string "user=$PUSHOVER_USER" \
-  --form-string "title=$1" \
-  --form-string "message=$2" \
-  https://api.pushover.net/1/messages.json
+  --form-string "title=$title" \
+  --form-string "message=$message" \
+  https://api.pushover.net/1/messages.json 2>&1)
+code=$?
+
+if [ "$code" -ne 0 ]; then
+  logger -t notify.sh "curl failed (exit $code): $output"
+elif
+  echo "$output" | grep -q '"status":0'
+then
+  logger -t notify.sh "pushover rejected message: $output"
+fi