UNIX/Linux Shell Script Quiz

What will be the output of   "echo this || echo that && echo other"?

	this
	that
	this other
	this that other
	other

How could you check if two strings are equal?

	test $a -eq $b
	test $a -equal $b
	test $a = $b
	sh -c test $a == $b

Which of the following would return the process ID of the sleep command?

	sleep 1 & echo $?
	sleep 1 & echo $#
	sleep 1 & echo $$
	sleep 1 & echo $!
	sleep 1 && echo $0
	test sleep 1

Which of the following will always output "maple"?

	$tree=maple; echo $tree
	tree = maple ; echo $tree
	export tree = maple; echo $tree
	tree=maple; export $tree; sh -c "echo $tree"
	tree=maple; export tree; sh -c "echo $tree"

Which of the following will output "cat"?

	case "dog" in *) echo cat ;; esac
	case "cat" in cat) echo $1 exit
	case cat dog rabbit; echo $1
	echo cat | case $1 in cat) echo $1 ;; esac
	case (cat dog rabbit) { echo $2 }

Which of the following will output "onetwothree"?

	for val ; do echo -n $val ; done < one two three
	for n in one two three ; do echo -n $n ; done
	for one two three ; do echo -n - ; done
	foreach n in one two three ; do echo -n $n ; done
	foreach n in one two three { echo -n $n }
	for n in one two three { echo -n $n }