Linux
- The Linus Torvalds is introduce the linux
1)what is linux?
— Linux is the operating system like windows and compare to a other os it have so much of security and Multi threading(parallel) and concurrency
- Multi threading — parallelly works the operation
- concurrency — Do all task in same time
2)Suspect and hibernate:-In windows the sleep mode name is hibernate .In linux called as suspect In our laptop you know what is the reason givies a sleep mode now i tell if you shutdown your os it will automatically delete the data in the RAM and other tasks so you use the sleep mode it does not consume the power and not erase the RAM Data int he (OS)now I easily explain the process.
suspect(sleep mode)->Ram->disk->start->disk->ram->previous page
NOW i turn on the suspect the RAM data are stores in the disk and whenever i turn on the (OS) then my data is not deleted in the Ram.
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UNICS — (uniplexed information and computing service) it is also a one type of operating system and thelinus torvalds taking some ideas in this OS and makes a linux os by adding some features like GUI(graphic user interface ) and adding some other tools.
linux architucture
APPLICATION->CLI->SHELL->KERNAL->HARDISK
EXPLAINATION:-first we type a command in the command line interface now the command is execute in the shell now already one shell is running in CLI page ($) And the shell contains lot number of types ex:-(csh-c shell,bash-bourne shell ) if i type a command in the cli normally its works. If i want to execute in the c shell (c programming language) Now i first type (csh) than after below i give what command i want it will execute in that c shell and the kernel read from the shell and the kernel convert the shell command into binary code and sent to a hard disk Y becoz the hardware(CPU,RAM,Storage) only knows the binary language so know kernel is a transulater the shell command is coverted to a binary machine understanding language then the process is repeated the hardware send a want we ask to. so that output is sent to a kernel and the kernel again transulate the binary code to our understanding code and send to a shell and show in the cli-command line interface this is the architecture of the linux.
One important thing -Your giving commands is not a command its a scripts inside a shell becoz the script is already kept inside a shell so we learn what what script are having inside a shell.
