OPS435 Quiz #3 - Solution
Student Name: _____________________________________________
Multiple Choice / Multiple Answer / True or False
Which of the following represent
determinant loops (i.e. the number of repetitions are known
in advance)? (Select all that apply)
a) until
b) while
c) case d)
for
Which of the following control
flow statements are more efficient to use with contant values
(such as the value being either 1, 2, 3 or 4)?
a)
if b)
case
c)
if-else d)
if-elif-else
Functions can only be used in
shell scripts.
a) true
b) false
(can be used in the shell as well)
Which of the following complex
regular expression symbols mean zero or more occurences of
the preceeding character (i.e. character that comes “before”)
a)
. b) ? c)
*
d) {0,1}
Write a Function for a bash shell script
Write
a portable Bash shell script to called validate.bash that prompts the
user for an integer (i.e. a simple number, no signs or decimal
places). If the user enters an invalid integer, indicate that what
user entered is invalid and to re-try. Write the script
below:
#!/bin/bash
function check()
{
read -p "Please enter an integer: " integer
until echo $integer | grep -q "^[0-9][0-9]*$"
do
read -p "Invalid integer. Please re-enter: " integer
done
}
check