Bash script to notify Slack channel (via webhook) when a command has completed.

notify-slack

#!/bin/bash
#
# Author:       Ade Goodyer
# Date:         2023-06-21T11:31
# Description:  Bash script to run command and then notify Slack of success or failure.
# Notes:        Create alias or add to PATH to use.
#               Requires chmod +x to run.
#
# Usage:        notify-slack        # usage
#               notify-slack ls     # slack notification without output
#               notify-slack -o ls  # slack notification with output
#

if [ $# -lt 1 ]; then
  echo "Usage: notify_slack [-o|--output] <command>"
  exit 1
fi

show_output=true
if [ "$1" == "-o" ] || [ "$1" == "--output" ]; then
  show_output=true
  shift
else
  show_output=false
fi

command="$@"

# Record the start time
start_time=$(date +%s.%N)

# Run the provided command and capture the output
output=$(eval "$command")

# Calculate the elapsed time
end_time=$(date +%s.%N)
elapsed_time=$(echo "$end_time - $start_time" | bc)

# Check the exit status of the previous command
if [ $? -eq 0 ]; then
  # Command completed successfully
  text="Command completed successfully.\n\nCommand: $command"
else
  # Command failed
  text="Command failed.\n\nCommand: $command"
fi

# Include output in the text if the flag is set to true
if [ "$show_output" = true ]; then
  text+="\n\nOutput:\n$output"
fi

text+="\n\nExecution Time: $elapsed_time seconds"

# Send the Slack webhook notification
payload='{"text": "'"$text"'"}'
curl -X POST -H 'Content-type: application/json' --data "$payload" "<slack_webhook_url>"