Pushover

Simplest curl command in one line

$ curl -s --form-string "token=abc123" --form-string "user=user123" --form-string "message=hello world" https://api.pushover.net/1/messages.json

For better reading

curl -s \
  --form-string "token=abc123" \
  --form-string "user=user123" \
  --form-string "message=hello world" \
  https://api.pushover.net/1/messages.json