You can use a command in support of your answer, but we are evaluating your written response.

1. A user runs ./check with no arguments and gets [: -gt: unary operator expected. Why?

   #!/bin/bash
   if [ $1 -gt 1 ]; then
    echo "Valid"
   fi
   

2. A student runs the script below with ./compare. It prints 3 is greater than 10, and ls now shows a new file named 10 in the directory. Why?

   #!/bin/bash
   num=3
   if [ "$num" > 10 ]; then
    echo "$num is greater than 10"
   fi
   

3. A user enters 0 at the prompt and the script prints Must be greater than 1 forever. What is the bug?

   read -p "Sides: " sides
   while [ "$sides" -le 1 ]; do
    echo "Must be greater than 1"
   done
   

4. Given the loop below, how many lines are printed when a user runs ./tasks "Buy milk" "Walk dog", and why?

   for task in $@; do
    echo "$task"
   done
   

5. Given the script below, a user runs ./dotinstall -a -h and sees Adding: -h, but the user guide never displays. Why?

   while getopts "ha:r:" opt; do
    case $opt in
        h) user_guide ;;
        a) echo "Adding: $OPTARG" ;;
        r) echo "Removing: $OPTARG" ;;
    esac
   done
   

6. A script uses while getopts "v" opt to handle a -v flag, then runs echo "File: $1" after the loop. A user runs ./script -v notes.txt and sees File: -v. Why, and what is one way to fix it?

7. Given the lines below from nums.txt, which lines will grep "[^0-9]" nums.txt output, and why?

   42
   3.14
   -5
   100
   

8. A student runs grep "3.14" values.txt and the output includes the line 3014. Why?

9. Given the lines below from emails.txt, only bob@gmail.com is output by grep -E "^[a-z]+@[a-z]+\.com$" emails.txt. Why did each of the other lines not match?

   kay@wright.edu
   bob@gmail.com
   Sally@gmail.com
   dana@mail.gmail.com
   

10. A student runs the command below to change a path in a config file and gets sed: -e expression #1, char 9: unknown option to 's'. Why, and what is one way to fix it?

    sed 's//home/ubuntu//home/kay/g' config.txt
    

11. The remove action in tt runs the line below, but the task is never deleted from .tasks, even though $task holds a description that is in the file. Why?

    sed -i '/$task/d' "$HOME/.tasks"
    

12. Given the lines below from sales.txt, why does awk '{print $2}' sales.txt print only blank lines?

    2024-01-15,Laptop,Electronics,3,899.99,2699.97
    2024-02-03,Blender,Kitchen,5,49.99,249.95