The candidate$$s attention is drawn to the shell syntax summary document which is attached

after the end of the examination paper.

Q$1.($a$)$ A shell variable FULLUSERNAME has the value

King James I, James VI of Scotland

There are no leading or trailing spaces, and there are four spaces following the

comma. Write out the result of executing the following shell commands. In each

case be sure to indicate exactly what would be printed including the presence

and quantity of space characters.

i$.$ echo FULLUSERNAME $[2]$

ii$.$ echo $FULLUSERNAME $[2]$

iii. echo $"$$FULLUSERNAME" $[2]$

iv$.$ echo $\text{'}$$FULLUSERNAME' $[2]$

$($b$)$ Consider the following statements which are exectued in a bash shell. Assume

that the shell$$s internal field separator variable, IFS, is set to its default value.

showargs $()\{$

for a in $"$$@$"$ ; do

echo $"$$a$"$

done

$\}$

i$.$ What is printed when showargs My name is Bond. "James Bond." is

executed? Explain your reasoning. $[4]$

ii$.$ The quotation marks are removed from around the $@ and the same command is executed. What is printed now? Explain the differences, if

any. $[4]$

iii. The quotation marks are restored and the $"$$@$"$ replaced with $"$$$*".$ The

same command is executed once more. Explain the difference in output

compared with the first time the function was invoked, if any. $[4]$

$($c$)$ In bash, the return command provides a return condition to the caller and

can only pass integers. Using an example, explain how a string value generated

by a funciton can be used by the caller.