Post a message to a Slack channel

slackpost.sh

#!/bin/bash
# ============================================================
#  Author: Chu-Siang Lai / chusiang (at) drx.tw
#  Blog: http://note.drx.tw
#  Filename: slackpost.sh
#  Modified: 2018-03-28 15:58
#  Description: Post a message to a Slack channel.
#  Reference:
#
#   - https://gist.github.com/dopiaza/6449505#gistcomment-1627214
#
# =========================================================== 

# Help.
if [[ "$1" == "-h" || "$1" == "--help" ]]; then
  echo 'Usage: slackpost.sh "<webhook_url>" "<channel>" "<username>" "<color>" "<message>"'
  exit 0
fi

# webhook & token.
WEBHOOK_URL=$1
if [[ $WEBHOOK_URL == "" ]]
then
  echo "No webhook_url specified"
  exit 1
fi
shift

# channel.
CHANNEL=$1
if [[ $CHANNEL == "" ]]
then
  echo "No channel specified"
  exit 1
fi
shift

# username.
USERNAME=$1
if [[ $USERNAME == "" ]]
then
  echo "No username specified"
  exit 1
fi
shift

# color.
COLOR=$1
if [[ $COLOR == "" ]]
then
  echo "No status specified"
  exit 1
fi
shift

# text.
TEXT=$*
if [[ $TEXT == "" ]]
then
  echo "No text specified"
  exit 1
fi

# convert formating.
MESSAGE=$( echo $TEXT | sed 's/"/\"/g' | sed "s/'/\'/g" )
JSON="{\"channel\": \"$CHANNEL\", \"username\":\"$USERNAME\", \"attachments\":[{\"color\":\"$COLOR\" , \"text\": \"$MESSAGE\"}]}"

# post to slack.
curl -s -d "payload=$JSON" "$WEBHOOK_URL" > /dev/null

It's can work on Rocket.Chat. 🚀