Answer Posted / preet mala

If we want to add content of file1 at the beginning of file2
then use the following command:-


cat file2 file1 >> file3 | mv file3 file2;

What is the use of the command 'ls -x chapter[1-5]' ?

1225

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What is in grep command?

1181

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What difference between cmp and diff commands?

1321

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What does grep v grep do?

1095

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Explain ‘system calls’ with respect to unix commands?

1106

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What does the metacharacter mean?

1145

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Is there a way to erase all files in the current directory, including all its sub-directories, using only one command?

1413

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How does pipe () work?

1106

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

1093

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How do you repeat a command in terminal?

1244

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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:

2278

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Does cp command overwrite files?

1219

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How do I open a port?

1104

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How do I search a whole word in vim?

1192

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What is unix command?

1272

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