Thread: Sudo shutdown vs Power Button

what's difference between sudo shutdown command , turning system off via power button or clicking appropriate menu item?

problem this: want turn computer off on timer, use

code:

 sudo shutdown -p -t 30 60

shutdown in 60 minutes 30 sec wait before kills everything

option still kills programs, causing them improperly save status. power off button never this.

question this:
how shut down computer on timer behaves same way if press power off button

i looked manual page shutdown , not find option -t. looked @ source code (it's part of upstart package) shutdown , -b there, nothing.

code:

...          /* compatibility options, ignored */  ...          { 't', null, null, null, "secs", null, null },  ...

so if relying on it, not need do. there might other way of sending signal programs not it.

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