Slack incoming webhooks from bash (send notification to slack from shell)

slack.sh

read -d '' SLACK_PAYLOAD_DATA << EOF
{
    "channel": "#channel",
    "username": "Bot",
    "text": "Message by _$(id -un)@$(hostname -f)_.",
    "icon_emoji": ":poop:",
    "attachments": [
        {
            "fields": [
                {
                    "title": "User",
                    "value": "$(id -un)",
                    "short": true
                },
                {
                    "title": "Host",
                    "value": "$(hostname -f)",
                    "short": true
                }
            ]
        }
    ]
}
EOF

SLACK_COMMAND="curl -X POST --data-urlencode 'payload=${SLACK_PAYLOAD_DATA}' https://hooks.slack.com/services/XXX/QQQ/WWW"

eval ${SLACK_COMMAND}