Shell Application Day

Build a command-line todo list manager in Bash. The app stores todos in a file and supports adding, viewing, completing, removing, and cleaning up tasks.

Repository: https://github.com/cmsc398w/course_docs

Submit your todo.sh script on Gradescope.

---

What to Build

Your script must support these commands:

Command	Description
./todo.sh add <task>	Add a new task
./todo.sh done <number(s)>	Mark task(s) complete
./todo.sh rm <number>	Remove a task
./todo.sh clean	Remove all completed tasks
./todo.sh	Display all tasks

Storage Format

Store todos in a plain text file, one per line, using [ ] for incomplete and [x] for complete.

Display Format

Show tasks with line numbers and emoji status indicators:

• Incomplete: ⬜
• Complete: ✅

$ ./todo.sh
     1  ⬜ Buy groceries
     2  ✅ Finish homework
     3  ⬜ Call dentist

Example Session

$ ./todo.sh add "Buy groceries"
Added: Buy groceries

$ ./todo.sh add "Finish homework"
Added: Finish homework

$ ./todo.sh add "Call dentist"
Added: Call dentist

$ ./todo.sh
     1  ⬜ Buy groceries
     2  ⬜ Finish homework
     3  ⬜ Call dentist

$ ./todo.sh done 1
Completed task #1

$ ./todo.sh
     1  ✅ Buy groceries
     2  ⬜ Finish homework
     3  ⬜ Call dentist

$ ./todo.sh rm 3
Removed task #3

$ ./todo.sh clean
Cleaned up 1 completed tasks

Useful Tools

Command	Suggested use
echo	add
sed	done, rm
grep + redirection	clean
cat -n	display

Starter Code

#!/bin/bash
# todo - Simple todo list manager

TODO_FILE="$HOME/.todos"

add_todo() {
    echo "IMPLEMENT ME!!"
}

# Write other functions here...

touch $TODO_FILE

case "$1" in
    add)    shift; add_todo "$@" ;;
    # add other cases here...
esac

Grading (25 pts)

5 points per function. A good-faith attempt on each part counts.