Answer Posted / dhanooj

1)open file ,point to that perticular line, give
command "dd"
it will delete the line and save the file by pressing ":wq"
2)grep -v 'string pattern' file > newfile
it will create newfile with all lines from the file
except the lines containing "string pattern"
3)sed "pattern/d" filename >tmpfile
will delete all lines having this pattern and will write
to newfile
4)sed "3,d" filename >tmpfile
will remove the line 3 and will write to tmpfile

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

650

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What is the first character of the output in ls l command?

637

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Which command is used to copy files?

562

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What is nr in awk command?

611

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What difference between cmp and diff commands?

729

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Which command can you use to find the currently running process in unix server?

592

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Describe the zip/unzip command using gzip.

615

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Which unix command to make a new directory?

594

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What is {} in find command?

584

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What are the general commands in using unix os for a beginner?

583

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What do chmod command do?

606

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What is command statement?

543

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What is the function of grep command in unix?

594

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How does the system know where one command ends and another begins?

1582

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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:

1768

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