Linux OS : Boot Process(BIOS, MBR, GRUB,Karnel, Init, Runlevel)

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What happens during Linux boot process ?

Read here:
https://www.thegeekstuff.com/2011/02/linux-boot-process

What happens during the Login by  Non-privileged user post reboot?

  • Init process (pid=1, uid =0 ) spwans the Login process  (pid-x,uid=0) 
    •  Fork() system call 
    •  Exec system call
  • Login Process 
    • Fork() System Call
    • setuid for the User (pid x, uid=0)
    • Exec System call 
  • Shell
    • Uid >0, PID x
  • Execute ~/.bashrc ; exports all the enviornment variables etc/


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