Answer the following statements true (T) or false (F)
1. The let command is a shell built in command that lets comparison of the different category of things.
2. The expr command is a shell built in command that is used for arithmetic operations.
3. The shell command language provides structured programming constructs such as if and loop.
4. The access mode of a file is changed to executable in order to make it available to x number of users.
5. escape (special) characters all start with the backslash (\).
1. False
2. True
3. True
4. False
5. True
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Which of the following strings contains balanced braces?
a) ab{cde{fg}hi{jkl} b) ab{cde{fghi}j}kl} c) {abc{de}{fg}hij}kl d) {ab{cde{fgh}ijkl}
Which of the following is true about the heapsort?
a) the heapsort does not require a second array b) the heapsort is more efficient than the mergesort in the worst case c) the heapsort is more efficient than the mergesort in the average case d) the heapsort is better than the quicksort in the average case