For this assignment, you will use bash create a simple inventory system. The system will store basic

information about items and allow the user to create, read, update, and delete them.

Storing Item Information

Item information will be stored in text files.

1. Files will be stored inside a directory called data within the same directory as your script.

2. Each file will be named based on the item number, an integer with exactly four digits, followed

by the extension .item.

3. An item file consists of exactly three lines:

simple_name (string with no whitespace) item_name (string)

current_quantity (integer) max_quantity (integer)

description (string)

4. Example file named 3923.item

b_water Bottled Water

35 99

The finest spring water you can purchase !

Script Execution

When the script is run, the following should occur.

1. Upon running your script, the user should be presented with the following menu:

Enter one of the following actions or press CTRL-D to exit.

C - create a new item

R - read an existing item

U - update an existing item

D - delete an existing item

2. The user then enters a one-character action (upper or lowercase), leading to one of the following.

C: an item file is created

(a) From the terminal, read the following one at a time

i. Item number (four digit integer)

ii. Simple name (string with no whitespace)

iii. Item name (string)

iv. Current quantity (integer)

v. Maximum quantity (integer)

vi. Description (string)

(b) Using the values entered by the user, create a new file in the data folder based on

the instructions above.

(c) Update data/queries.log by adding the following line:

CREATED: simple_name - date

where simple_name is the items short name and date is the output from the date

command.

(d) If the item number already exists, print the following error and continue with the

script.

ERROR: item already exists

R: read an existing items information

(a) Prompt the user for an item number:

Enter an item number:

(b) Search for the specified item using the item number.

(c) Print the item information in the following format:

Item name: item_name

Simple name: simple_name

Item Number: item_number

Qty: current_quantity/max_quantity

Description: description

(d) If the item is not found, print the following error and continue with the script.

ERROR: item not found

U: update an existing item

(a) Prompt the user for the following one at a time

i. Item number (four digit integer)

ii. Simple name (integer with no spaces)

iii. Item name (string)

iv. Current quantity (integer)

v. Maximum quantity (integer)

vi. Description

(b) Search for the specified item using the item number.

(c) Update each of the corresponding fields based on the user input. If the user input

is blank for a particular field (except item number), keep the original value

from the file.

(d) Update data/queries.log by adding the following line:

UPDATED: simple_name - date

where simple_name is the items short name and date is the output from the date

command.

(e) If the item is not found, print the following error and continue with the script.

ERROR: item not found

D: delete an existing item

(a) Prompt the user for an item number:

Enter an item number:

(b) Delete the specified items file

(c) Update data/queries.log by adding the following line:

DELETED: simple_name - date

where simple_name is the items short name and date is the output from the date

command.

(d) Print the following message with the items simple name:

simple_name was successfully deleted.

(e) If the item is not found, print the following error and continue with the script.

ERROR: item not found

If an invalid character is entered, print the following error and continue with the script.

ERROR: invalid option

3. After an action is completed, display the menu again. This should go on indefinitely until

CTRL-D or the end of a file is reached.

Assignment Data

An initial data set can be found in /usr/local/courses/assign1.

Copy this to your own assignments directory.

Script Files

Your program should consist of five bash files:

assign1.bash - the main file which is initially invoked

create.bash - logic for the create option

read.bash - logic for the read option

update.bash - logic for the update option

delete.bash - logic for the delete option

Verifying Your Program

Your program must work with the input provided in a1Input.txt. To test it:

1. Verify that your assignment folder has a data directory with the initial data set.

2. Execute your script and redirect a1Input.txt into it. You should not be copying or typing

the contents of a1Input.txt into your terminal. Redirection must work.

3. Verify that the output and files are as expected.