Useful bash scripts

bash log-util

#!/bin/bash

# This script should be sourced

case "$LOG_LEVEL" in
     debug)
          set -x
          LOG_DEBUG="DEBUG"
          LOG_VERBOSE="VERBOSE"
          LOG_MESSAGE="MESSAGE"
          ;;
     verbose)
          LOG_VERBOSE="VERBOSE"
          LOG_MESSAGE="MESSAGE"
          ;;
     quiet)
          LOG_QUIET="QUIET"
          ;;
     *)
          echo "LOG_LEVEL not set to 'verbose', 'debug', 'quiet', assuming 'message' level verbosity"
          LOG_MESSAGE="MESSAGE"
          ;;
esac

log() {
     LEVEL=$1
     MESSAGE=$2

     DATE=`/bin/date`
     case "$LEVEL" in
          DEBUG)
               if [ -n "$LOG_DEBUG" ]
               then
                    echo "$DATE DEBUG: $MESSAGE"
               fi
               ;;
          INFO)
               if [ -n "$LOG_VERBOSE" ]
               then
                    echo "$DATE INFO: $MESSAGE"
               fi
               ;;
          MESSAGE)
               if [ -n "$LOG_MESSAGE" ]
               then
                    echo "$DATE MESSAGE: $MESSAGE"
               fi
               ;;
          ERROR)
               echo "$DATE ERROR: $MESSAGE" >&2
               ;;
     esac
}