redbull.sh

#!/bin/bash

# Red Bull for Hard Drives
# ------------------------------------------------------------------------
# Run this script once to keep your mounted Time Machine or other external
# hard drive(s) from falling asleep and making your system hang every time
# the drive wakes up.
#
# Usage:
# 1.  Be sure to chmod +x this file before trying to execute it.
# 2.  Run /path/to/redbull.sh '{VOLUME_NAME}', replacing {VOLUME_NAME} with
#     the case-sensitive name of the volume you want to keep from sleeping
#     (keep the single quotes though).
# 3.  Enter your admin password when prompted.
# 4.  Rejoice.

if [ "$1" != "" ]; then
  
  VOLNAME="$1"
  VOLPATH="/Volumes/$VOLNAME"
  
  if [ -d "$VOLPATH" ]; then
  
    sudo touch "$VOLPATH/.nosleepforyou"
    echo "*/5 * * * * touch -c '$VOLPATH/.nosleepforyou'" | sudo crontab
    
    echo
    echo "All done. You can verify by using the command 'sudo crontab -l'"
    echo "(that's a lowercase L)."
    echo
  
  fi
  
fi