shell script to send slack notifications

send_slack.sh

#!/bin/sh

send_slack() {

        if [ -z "${SLACK_TOKEN}" ];then
                echo "function send_slack needs SLACK_TOKEN variable. Add a new integration to slack."
                exit 1
        fi
        if [ -z "${1}" ];then
                echo "No text to send ? Are you kidding me ?"
                exit 1
        fi
        [ -z "${SLACK_CHAN}" ] && SLACK_CHAN="#tests"
        [ -z "${SLACK_USERNAME}" ] && SLACK_USERNAME=YOURBOT
        [ -z "${SLACK_ICON}" ] && SLACK_ICON=":postal_horn:"

        URL=https://YOURSLACKACCOUNT.slack.com/services/hooks/incoming-webhook?token=${SLACK_TOKEN}

        curl -X POST --data-urlencode 'payload={"channel": "'${SLACK_CHAN}'", "username": "'${SLACK_USERNAME}'", "text": "'"${*}"'", "icon_emoji": "'${SLACK_ICON}'"}' ${URL} > /dev/null 2>&1
}