What does ls -r do?
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Which type of boot occurs when the computer is already on, and you restart it without turning off the power.
What does nslookup do?
What is an a record, an ns record, a ptr record, a cname record, an mx record?
How many types of files are there in linux?
What is the maximum length for a filename under linux?
Why we use red hat linux?
Who invented semaphore?
What is process id 1 in linux?
Why is mutex needed?
What is the difference between an environment and a local variable?
Who wc linux?
What are the kinds of permissions under linux?