Invoking _________ returns the first element in an ArrayList x.
a. x.first()
b. x.get(0)
c. x.get(1)
d. x.get()
b
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Write and run a simple shell script named echomyvar that displays the PID (Sobell, page 480) of the process running the script and value of the variable named myvar. Display the PID of the interactive shell you are working with. What is the value of the variable within the process running the shell script? Are the interactive shell and the shell running the script run by the same or different processes (do they have the same PID)?
$ cat echomyvar echo The PID of this process is $$ echo The value of myvar is: $myvar $ echo $$ 2651 $ ./echomyvar The PID of this process is 4392 The value of myvar is:
Explain the difference between a multicast and a broadcast.
What will be an ideal response?
A(n) ____________________ is hardware or software that blocks or allows transmission of information packets based on criteria such as port, IP address, and protocol.
Fill in the blank(s) with the appropriate word(s).
If the search item is the 900th item in the list, the sequential search makes ____ key comparisons to determine whether the search item is in the list.
A. 100 B. 900 C. 9000 D. 90,000