By: Team SE-EDU Since: Jun 2016 Licence: MIT

1. Introduction

AddressBook Level 3 (AB3) is for those who prefer to use a desktop app for managing contacts. More importantly, AB3 is optimized for those who prefer to work with a Command Line Interface (CLI) while still having the benefits of a Graphical User Interface (GUI). If you can type fast, AB3 can get your contact management tasks done faster than traditional GUI apps. Interested? Jump to the Section 2, “Quick Start” to get started. Enjoy!

2. Quick Start

  1. Ensure you have Java 11 or above installed in your Computer.

  2. Download the latest addressbook.jar here.

  3. Copy the file to the folder you want to use as the home folder for your Address Book.

  4. Double-click the file to start the app. The GUI should appear in a few seconds.

  5. Type the command in the command box and press Enter to execute it.
    e.g. typing help and pressing Enter will open the help window.

  6. Some example commands you can try:

    • list : lists all contacts

    • addn/John Doe p/98765432 e/ a/John street, block 123, #01-01 : adds a contact named John Doe to the Address Book.

    • delete3 : deletes the 3rd contact shown in the current list

    • exit : exits the app

  7. Refer to Section 3, “Features” for details of each command.

3. Features

Command Format

  • Words in UPPER_CASE are the parameters to be supplied by the user e.g. in add n/NAME, NAME is a parameter which can be used as add n/John Doe.

  • Items in square brackets are optional e.g n/NAME [t/TAG] can be used as n/John Doe t/friend or as n/John Doe.

  • Items with ​ after them can be used multiple times including zero times e.g. [t/TAG]…​ can be used as   (i.e. 0 times), t/friend, t/friend t/family etc.

  • Parameters can be in any order e.g. if the command specifies n/NAME p/PHONE_NUMBER, p/PHONE_NUMBER n/NAME is also acceptable.

3.2. Adding a person: add

Adds a person to the address book

A person can have any number of tags (including 0)


  • add n/John Doe p/98765432 e/ a/John street, block 123, #01-01

  • add n/Betsy Crowe t/friend e/ a/Newgate Prison p/1234567 t/criminal

3.3. Listing all persons : list

Shows a list of all persons in the address book.
Format: list

3.4. Editing a person : edit

Edits an existing person in the address book.
Format: edit INDEX [n/NAME] [p/PHONE] [e/EMAIL] [a/ADDRESS] [t/TAG]…​

  • Edits the person at the specified INDEX. The index refers to the index number shown in the displayed person list. The index must be a positive integer 1, 2, 3, …​

  • At least one of the optional fields must be provided.

  • Existing values will be updated to the input values.

  • When editing tags, the existing tags of the person will be removed i.e adding of tags is not cumulative.

  • You can remove all the person’s tags by typing t/ without specifying any tags after it.


  • edit 1 p/91234567 e/
    Edits the phone number and email address of the 1st person to be 91234567 and respectively.

  • edit 2 n/Betsy Crower t/
    Edits the name of the 2nd person to be Betsy Crower and clears all existing tags.

3.5. Locating persons by name: find

Finds persons whose names contain any of the given keywords.

  • The search is case insensitive. e.g hans will match Hans

  • The order of the keywords does not matter. e.g. Hans Bo will match Bo Hans

  • Only the name is searched.

  • Only full words will be matched e.g. Han will not match Hans

  • Persons matching at least one keyword will be returned (i.e. OR search). e.g. Hans Bo will return Hans Gruber, Bo Yang


  • find John
    Returns john and John Doe

  • find Betsy Tim John
    Returns any person having names Betsy, Tim, or John

3.6. Deleting a person : delete

Deletes the specified person from the address book.
Format: delete INDEX

  • Deletes the person at the specified INDEX.

  • The index refers to the index number shown in the displayed person list.

  • The index must be a positive integer 1, 2, 3, …​


  • list
    delete 2
    Deletes the 2nd person in the address book.

  • find Betsy
    delete 1
    Deletes the 1st person in the results of the find command.

3.7. Clearing all entries : clear

Clears all entries from the address book.
Format: clear

3.8. Exiting the program : exit

Exits the program.
Format: exit

3.9. Saving the data

Address book data are saved in the hard disk automatically after any command that changes the data.
There is no need to save manually.

3.10. Encrypting data files [coming in v2.0]

{explain how the user can enable/disable data encryption}

4. FAQ

Q: How do I transfer my data to another Computer?
A: Install the app in the other computer and overwrite the empty data file it creates with the file that contains the data of your previous Address Book folder.

5. Command Summary

    e.g. add n/James Ho p/22224444 e/ a/123, Clementi Rd, 1234665 t/friend t/colleague

  • Clear : clear

  • Delete : delete INDEX
    e.g. delete 3

  • Edit : edit INDEX [n/NAME] [p/PHONE_NUMBER] [e/EMAIL] [a/ADDRESS] [t/TAG]…​
    e.g. edit 2 n/James Lee e/

    e.g. find James Jake

  • List : list

  • Help : help