Answer Posted / akshita

1. multi-user: it implies that many users can work
simultaneously...every user working thinks that he is the
sole occupant of the computer resources but in reality every
user is alloted cpu time and other resources according to
cpu scheduling techniques ..and hence all computer resources
are shared by users working at same point of time..

2. multi-tasking: it implies that multiple tasks could be
performed simultaneously...for exammple:if u r working in
windows environment u access internet and u r also listening
songs..and u are working on some document also..

3. time sharing: in this method the cpu allocates every
user a very small time slice or time slot in
micromilliseconds...
when the time slot for a particular user
ends..the the cpu allots same time slot to next process..and
so on..in this way every proess is given time slice in a
circular fashion..

Name the various commands that are used for the user information in unix.

763

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

885

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What is the size of time_t?

879

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What command will change your prompt to myprompt?

899

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What is the use of the tee command?

803

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Why is it called grep?

741

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What is time_t?

769

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Name the unix command to find how many days the server has been up.

850

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What will the following command do?

800

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What is unix command?

857

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

790

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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:

1956

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What is grep and how do you use it?

770

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How to use grep command to list find the records of a file containing 10 different strings?

830

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What happens when we execute a unix command?

790

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