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Shut down, reboot, and sleep

From: Unix for Mac OS X Users

Video: Shut down, reboot, and sleep

In this movie I'm going to show you how you can shut down, reboot, and sleep your computer from the Unix command line. Not only can we perform these actions just like we can in the Finder, but from the command line we get an extra cool bonus we can schedule these actions. Now before we get started I want you to proceed carefully. I don't want to be responsible if you put your computer to sleep or reboot and you lose data in a file that you're in the process of editing. So take a moment and make sure that all your files are saved and everything so that if you did accidentally trigger a shutdown you wouldn't lose anything important. Now the command that we're going to use for all three of these, for shut down, reboot and sleep, is going to be the shutdown command. That may not seem intuitive, but that's the command that we use for all three of them and in order to use the shutdown command we always have to use it with sudo.

Shut down, reboot, and sleep

In this movie I'm going to show you how you can shut down, reboot, and sleep your computer from the Unix command line. Not only can we perform these actions just like we can in the Finder, but from the command line we get an extra cool bonus we can schedule these actions. Now before we get started I want you to proceed carefully. I don't want to be responsible if you put your computer to sleep or reboot and you lose data in a file that you're in the process of editing. So take a moment and make sure that all your files are saved and everything so that if you did accidentally trigger a shutdown you wouldn't lose anything important. Now the command that we're going to use for all three of these, for shut down, reboot and sleep, is going to be the shutdown command. That may not seem intuitive, but that's the command that we use for all three of them and in order to use the shutdown command we always have to use it with sudo.

So sudo shutdown and then immediately after we have to specify one of three options. We have to tell it we want to shut down, reboot or sleep, and we do that with the h, r or s option. h stands for halt, so halt would be to shut down. All three of these options then after that need a time. They want you to specify what time you should shut down and the time format can be one of three things. You can either say shut down now, shut down in a certain number of minutes from now and this case use the plus sign followed by a number, or at a specified date and the date format will be the two last digits of the year followed by two digits for the month, two digits for the date, two digits for the hour, and two digits for the minute.

Now it's a little difficult for me to demonstrate shutting down my computer, so let's just take a look at what some of these might look like. So if we wanted to just do shutdown now the same way that the Finder does it, well then you would do sudo shutdown with the H option for halt and then the word now. If we wanted to schedule it for 45 minutes from now then you could do the same thing but use +45. And if we wanted to shut down at a specified date and time well then you use the date, remember for the year you leave off the first two digits, so it would be 110601 and then zeroes to represent midnight.

Reboot works exactly the same way the only difference is that now we're using the r option instead of the h option. So the first one, reboot now, is the exact same behavior as the Finder has or we can schedule in the future at either a relative or an absolute date. And then for sleep we have the same thing but with the s option. One place that I find this especially useful is that if I'm working late at night, it's almost bed time and I'm doing some long-running process. I'm FTPing a whole lot of files up to a server and its going to take another 30 minutes. Well I can go in to Unix and I can say all right, one hour from now I want my Mac to go to sleep. Then I can go to bed, my file transfer are finish, and then when I'm done my computer will just go to sleep, ready for me to then come back in the next morning.

Now in addition to the shutdown command there also is a Unix command for halt and reboot, but they're not preferable. It's better to use shutdown. So even though you may see halt and reboot in there, shutdown is a better choice. Now for sleep there is a sleep command in Unix, but it's totally different. Because in the days when Unix was embedded computers didn't go to sleep. They were either on or they were off. They didn't have energy-saving modes. So the sleep command in Unix actually just tells Unix to wait for a specified amount of time, so if I say sleep 3, then it waits for three seconds and then it pops back up and give me another command prompt. You can use this with commands.

So sleep 3 and then we could do something hello and wait three seconds and it will do the thing that I asked it to do. So it does have a use especially once we start doing scripting in Unix, but it's completely unrelated from sleeping your computer the way that you're normally used to doing it.

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This video is part of

Image for Unix for Mac OS X Users
Unix for Mac OS X Users

82 video lessons · 25625 viewers

Kevin Skoglund
Author

 
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  1. 3m 57s
    1. Introduction
      1m 14s
    2. Using the exercise files
      2m 43s
  2. 32m 2s
    1. What is Unix?
      7m 27s
    2. The terminal application
      4m 23s
    3. Logging in and using the command prompt
      5m 19s
    4. Command structure
      5m 22s
    5. Kernel and shells
      5m 25s
    6. Unix manual pages
      4m 6s
  3. 15m 58s
    1. The working directory
      2m 49s
    2. Listing files and directories
      3m 59s
    3. Moving around the filesystem
      4m 58s
    4. Filesystem organization
      4m 12s
  4. 1h 4m
    1. Naming files
      5m 41s
    2. Creating files
      2m 19s
    3. Unix text editors
      6m 39s
    4. Reading files
      5m 35s
    5. Reading portions of files
      3m 27s
    6. Creating directories
      2m 40s
    7. Moving and renaming files and directories
      8m 32s
    8. Copying files and directories
      3m 7s
    9. Deleting files and directories
      3m 38s
    10. Finder aliases in Unix
      4m 10s
    11. Hard links
      5m 30s
    12. Symbolic links
      6m 36s
    13. Searching for files and directories
      6m 32s
  5. 34m 58s
    1. Who am I?
      4m 3s
    2. Unix groups
      1m 52s
    3. File and directory ownership
      6m 41s
    4. File and directory permissions
      4m 27s
    5. Setting permissions using alpha notation
      6m 49s
    6. Setting permissions using octal notation
      3m 49s
    7. The root user
      1m 57s
    8. sudo and sudoers
      5m 20s
  6. 52m 34s
    1. Command basics
      4m 4s
    2. The PATH variable
      4m 13s
    3. System information commands
      3m 40s
    4. Disk information commands
      6m 8s
    5. Viewing processes
      5m 0s
    6. Monitoring processes
      3m 36s
    7. Stopping processes
      3m 19s
    8. Text file helpers
      6m 50s
    9. Utility programs
      7m 28s
    10. Using the command history
      8m 16s
  7. 20m 39s
    1. Standard input and standard output
      1m 24s
    2. Directing output to a file
      4m 13s
    3. Appending to a file
      2m 44s
    4. Directing input from a file
      5m 28s
    5. Piping output to input
      4m 40s
    6. Suppressing output
      2m 10s
  8. 41m 28s
    1. Profile, login, and resource files
      9m 11s
    2. Setting command aliases
      6m 59s
    3. Setting and exporting environment variables
      4m 54s
    4. Setting the PATH variable
      6m 10s
    5. Configuring history with variables
      6m 17s
    6. Customizing the command prompt
      6m 5s
    7. Logout file
      1m 52s
  9. 1h 25m
    1. grep: Searching for matching expressions
      5m 21s
    2. grep: Multiple files, other input
      4m 28s
    3. grep: Coloring matched text
      2m 57s
    4. Introduction to regular expressions
      3m 22s
    5. Regular expressions: Basic syntax
      3m 19s
    6. Using regular expressions with grep
      5m 20s
    7. tr: Translating characters
      8m 17s
    8. tr: Deleting and squeezing characters
      5m 30s
    9. sed: Stream editor
      7m 45s
    10. sed: Regular expressions and back-references
      7m 8s
    11. cut: Cutting select text portions
      7m 42s
    12. diff: Comparing files
      4m 35s
    13. diff: Alternative formats
      4m 30s
    14. xargs: Passing argument lists to commands
      7m 25s
    15. xargs: Usage examples
      7m 59s
  10. 42m 25s
    1. Finder integration
      4m 45s
    2. Clipboard integration
      5m 5s
    3. Screen capture
      3m 42s
    4. Shut down, reboot, and sleep
      3m 34s
    5. Text to speech
      2m 36s
    6. Spotlight integration: Searching metadata
      3m 41s
    7. Spotlight integration: Metadata attributes
      4m 24s
    8. Using AppleScript
      5m 23s
    9. System configurations: Viewing and setting
      5m 51s
    10. System configurations: Examples
      3m 24s
  11. 1m 26s
    1. Conclusion
      1m 26s

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