Ans: These keys have significant meaning sometimes DELETE is called as RUBOUT key. Break is sometimes called INTERRUPT. In most SYSTEMS the delete key stops a program immediately, without waiting for it to finish on some systems, Ctrl-C provides this service. Break is a synonym for DELETE or CTRL-C.

Ans: The kill command takes the PID as one argument; this identifies which process to terminate. The PID of a process can be got using 'ps' command.

Ans: We can use modload and the module name.

Ans: Valid, Reference, Modify, Copy on write, Age. These bits are the part of the page table entry, which includes physical address of the page and protection bits.

Page address
Age Copy on write Modify Reference Valid Protection

Ans: The window of the working set of a process is the total number in which the process had referred the set of pages in the working set of the process.

Ans: Vis that copied its standard input to its standard output, except that it makes all non printing characters visible by printing them as nn, where nnn is the octal value of the character. Vis is invaluable for detecting strange or unwanted characters that may have crept into files.

Ans: Every file has following attributes: owner's user ID ( 16 bit integer ) owner's group ID ( 16 bit integer ) File access mode word 'r w x -r w x- r w x' (user permission-group permission-others permission) r-read,...  

Ans:
It sets the valid bit of the page by clearing the modify bit.
It recalculates the process priority.

Ans: Fork () is a system call to create a child process. When the parent process calls fork() system call, the child process is created and if there is short of memory then the child process is sent to the read-to-run state in the swap device, and return to the user state without swapping the parent process. When the memory will be available the child process will be swapped into the main memory.

Ans: This contains the private data that is manipulated only by the Kernel. This is local to the Process, i.e. each process is allocated a u-area.