• shutdown is commonly used to down the system
• Under linux and BSD, -r reboots and -h halts
• generally, no flag means goto single-user
• When is required: Such as 'shutdown -r now'
• time can be specified in +minutes, e.g. +5
• warning messages sent every hour when > 3 hours
  every 30 minutes when > 1 hour
  every 15 minutes when > 10 minutes
  every 1 minute thereafter
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