Answer Posted / ahmed

Use sed command
sed -i'' '1 i this is firts line' temp123

Write a command that will allow a unix system to shut down in 15 minutes, after which it will perform a reboot.

628

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What are some command words?

569

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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:

1766

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What are the differences among a system call, a library function, and a unix command?

571

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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?

593

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What is the use of the tee command?

602

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Is ‘du’ a command? If so, what is its use?

639

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Enlist some filename manipulation commands in unix.

556

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What is a command and examples?

590

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What does this command do,"$more readme.txt“?

693

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What is the behavioural difference between cmp and diff commands?

682

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Which unix command lists files/folders in alphabetical order?

622

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what is the advaantage of each user having its own copy of the shell?

2040

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What is grep and how do you use it?

581

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What is the function of grep command in unix?

593

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