Answer Posted / sivasankar.s

cat command displays the contents of the file.

Ex :
$ cat fruits.txt
apple
orange
grapes

touch command changes the modified date and time of the
file.

before use touch command
$ls -ltr
-rw-r--r-- 1 s aaa 20 Oct 29 16:39 fruits.txt

$ touch fruits.txt

$ls -ltr
-rw-r--r-- 1 s aaa 20 Oct 29 16:51 fruits.txt

Explain mount and unmount command.

611

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Write a command to kill the last background job?

618

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What are grep patterns?

575

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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 is the use of tee command?

567

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Using unix command how to display no of records in oracle?

604

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What is the functionality of a top command?

623

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What is $0 bash?

646

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why metadb requires a seperate slice to create Solaris volume manager

2552

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What is sed awk grep?

602

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What is the size of time_t?

642

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Explain ‘system calls’ with respect to unix commands?

599

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hw will u use awk in replacing cahrs and files

2726

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What are filter commands in unix?

553

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

629

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