Which of the following is an appropriate antivirus policy?
A) E-mail attachments are always safe to open.
B) It is safe to download files from the Internet.
C) Always use a virus scanner.
D) Believe all “security alerts” that you receive.
C) Always use a virus scanner.
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Using the fact that the shell construct ${#var} gives the number of characters stored in var, rewrite wc in the shell. Be sure to use integer arithmetic! (Notes: Change your IFS variable to just a newline character so that leading whitespace characters on input are preserved, and also use the -r option to the shell's read command so that terminating backslash characters on the input are ignored.)
What will be an ideal response?
In the readers/writers problem, cascading in readers ________.
a) forces all arriving threads to wait b) continues until all waiting readers have become active c) allows waiting readers to become active as soon as another reader finishes d) all of the above