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.

Write a command to kill the last background job?

620

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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:

1764

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What do chown command do?

536

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How do I search for text in vi?

588

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How do you repeat a command in terminal?

592

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Is there any method to erase all files in the current directory, along with its all sub-directories, by using only one command?

591

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What is the use of the command 'ls -x chapter[1-5]' ?

663

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What are the dos commands?

652

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Explain the terms ‘system calls’ and ‘library functions’ with respect to unix commands?

644

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Write a command that will find all text files in a directory such that it does not contain the word "amazing" in any form (that is, it must include the words amazing, amazing, or amazing)?

962

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What is the use of sed command in unix?

601

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What are file commands?

655

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What are filter commands in unix?

555

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What's a command word?

591

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What command is used to switching between users in unix?

564

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