I`m using Ubuntu 12.04 and I need to power on my computer by creating a task just like wake up my phone by setting alarm in Nokia phones,Can i do this in Linux Systems?
4 Answers
After shutdown, your computer is off. So nothing can happen with it, unless you press the power button manually.
Of course, they may be some alternative like Wake-on-LAN capabilities if supported by your BIOS. This is a mechanism by which specific packets are sent to a powered off computer (but of course still connected to a power source and an Ethernet network) to power it on.
Obviously, this has to be done from a source external to your computer.
Unfortunately, not all BIOS and network adapters support Wake-on-LAN
More info about Wake-on-LAN at Wikipedia.
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From any device with internet access you can wake-up your machine from internet or LAN (if enabled in BIOS and forwarded properly trough a router, if any) by means of magic packet. The proper wake up event must be enable in bios for a desired suspend state like S3/S4.

wakeonlan(Linux command line) A tool to send a Wake-On-LAN "Magic Packet"
sudo apt-get install etherwake
wakeonlan -i ipaddress
- Wol, Wake On Lan Android

or this

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Sorry, but I don't think so. Linux system are booting and shutting down more complicated than the java-language made os that Nokia used to use (Now it produces only smartphones with windows, android and symbian). So, sorry but I don't think that you can make it.
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Thinking outside the box option:
If your PC's BIOS supports the option of booting when AC power is applied, you can select this option, then use a power outlet timer to apply power to the PC at the desired time.
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