All OS questions were based on basics of UNIX all small -2 commands.

1) how image of one process can be replaced by other process
    a) exec

2) how image of one process can be copied to new born process
     a) fork

3) how can you list all the files used by a particular process

4) how do u create a link of  file

1) execlp() command is used for this. It is called Overlaying. It has 3 parameters. Name of new process and 2 more.

2) By default image of new born process is the image of its parent.

4) sn command.. soft link command

A soft link or a symbolic link is the one which only points to the file ,

but a hard link is the one which when deleted , deletes the actual file too.