Answer Posted / raghavendra sharma

Multi-tasking:it is nothing but a single system with one
processor performs execution of more than one process.

Multi-user:multi-user may be defined as using of same
process or program by no of users at a single unit of
time.EX:when we consider google database it is accessed by
millions of users at a time from different parts of world.

Multi-processing:multi-processsing is a special technique
in which a single system consists of more than one
processors and each process is done by all the processors.
Advantage:Each process is executed in very small amount of
time.
Disadvantage:It is very costly process.

Time-sharing:time-sharing is a process in which if there
exists more than one process each process is executed by
giving certain amount of time after that time control is
switched to next process and vice-versa.
Advantage:all process are executed simultaneously.
Disadvantage:it takes lot of time to execute all processes.

Describe the usage and functionality of the command rm –r * in unix?

829

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What is the size of time_t?

655

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Differentiate cat command from more command.

582

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What is the use of awk command in unix?

583

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why metadb requires a seperate slice to create Solaris volume manager

2558

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How to find $ai_serual resolved path by using unix

1030

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Name the general commands in using unix os for a beginner?

626

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What does touch command do in unix?

734

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What is updatedb?

590

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How do you grep a case insensitive?

545

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What are file commands?

656

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What does this command do,"$more readme.txt“?

693

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Which command is used to create a directory?

577

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When i run a programm of orphan process. Instead of getting child's parent (ppid)=1 ..i get 1400 and it varies as per system. How can i findthe right soluion??? My pgm: #include # include int main() { int pid; pid=fork(); if(pid < 0) {exit(-1);} else if(pid==0) { printf("Child Process is Sleeping ..."); sleep(10); printf("Orphan Child's Parent ID : %u ",getppid()); } else { printf("Parent Process Completed ... %u ",getpid()); exit(0); } return 0; } Output:

1766

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What does grep v do?

562

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