Answer Posted / manish

1. Regular file:(-):contains data in either text format or
binary format
2. Directory file:(d):contains entries of files
3. FIFO file:(f):2 communicate betn 2 processes running on
same system
4. Block special file:(b):name given 2 special blocks of
hard disk
5. Sybolic file:(l):its a link or pointer to already
existing file
6. Socket file:(s):2 communicate betn 2 processes running on
different system in a network
7. Character special file:(c):handles only characted
formatted data
eg.stdin, stdout, stderr

Why is it called grep?

573

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Differentiate cat command from more command.

592

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How do you grep recursively?

568

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What is awk used for?

628

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What is ‘ps’ command for?

625

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Why is grep called grep?

793

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How do you grep a case insensitive?

552

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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:

1774

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Which command is used to kill the last background job?

791

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What is the use of sed command in unix?

610

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What is command statement?

555

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What do chmod command do?

610

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What is command substitution?

631

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Who wrote grep?

591

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

658

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