Answer Posted / sumitabha das

sed is a multipurpose tool which combines the work of
several filters.

sed uses instructions to act on text.
AN instruction combines an address for selecting lines with
an action to be taken on then , as shown by the syntax

sed options 'address action' file(s)

What is awk good for?

582

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How do I delete files from command prompt?

549

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What are the unix commands?

555

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What is “chmod” command?

562

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What does the md command do?

568

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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:

1758

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What does 'mkdir' command do in UNIX?

658

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What is the function of grep command in unix?

583

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What is the difference between cat and more command?

623

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How do I use grep to find a file?

577

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What is the command to find hidden files in the current directory?

579

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What is $0 bash?

646

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What is the difference between grep and grep?

563

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Explain mount and unmount command.

611

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Which unix command lists files/folders in alphabetical order?

614

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