Send slack message from shell script

slack-me

#!/bin/bash

# Slack bot token to use for auth.
token=xoxb-1234567890-ABCDEFGHIJK1234567890
# Channel ID or user ID to post to.
channel=U12345678
# Name of bot user to post message as.
username=warnbot
# Emoji to use as icon for message.
emoji=":warning:"

function send_message {
    curl --silent --output /dev/null \
    --data "token=$token" \
    --data "channel=$channel" \
    --data "as_user=false" \
    --data "username=$username" \
    --data "icon_emoji=$emoji" \
    --data-urlencode "text=$1" \
    https://slack.com/api/chat.postMessage
}

# If run non-interactively, send from stdin.
if [ ! -t 0 ]; then
    text=$(cat)
    send_message "$text"
    exit
fi

# If run interactively and no argument is set, show usage.
if [ $# -ne 1 ]; then
    echo "Usage:"
    echo "slack-me \"<message to send>\""
    echo "or"
    echo "echo \"blah\" | slack-me"
    exit 1
fi

# Otherwise send message passed in argument.
send_message "$1"