- A UNIX machine should (almost) never be just turned off.
- It is also important for the Systems Administrator to understand what the correct mechanism is to shut a UNIX machine down
- There are a number of steps to carry out to ensure that the operating system and many of its support functions remain in a consistent state.
Step before shutdown
- List of all logged-in user by “who” command. You might sent broadcast message to let user know the system being shutdown
- Flush file system buffer to physical disk by “sync”
- Use Shut Down command
Commands to shut down
- /usr/sbin/shutdown
- /sbin/init
- /usr/sbin/halt
- /usr/sbin/reboot
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