The lab work consists of all practical tasks which must be submitted via Moodle.
You must submit the following:
A single zip file, uploaded to Moodle.
Note: Each Lab session is worth 1% of your final mark
Learning Outcomes Assessed
The following learning outcomes are being assessed in this lab session:
Use the command-line on a UNIX system
Manage a Linux server system (including files, processes, users)



Lab 8 – Practical tasks

Create a script findBigFiles that will take as an argument:
The size in MB that is considered to be a big file.

The script will return the following information for the current working directory ($pwd):
The list of large files
The number of files found
The date and time of the search

Breakdown of Tasks
Add comments (script name, author, date and purpose) at the start of your script as appropriate
Create a function usage that will print out the correct usage as shown below

***************************************
USAGE: $SCRIPT_NAME [Number_Of_Meg_Bytes]
EXAMPLE: $SCRIPT_NAME 5
Will Find Files Larger Than 5 Mb in and below the Current Directory...

EXITING...
**************************************

In the main part of your script, test the number of arguments so that if the script does not have 1 argument, it prints the usage and exits.
Hint:
To exit the script (i.e. if the number of arguments is incorrect), use the command exit 1

In order to allow the user to exit using CTRL+C, we need to add the following code.
In the FUNCTION section:
function trap_exit
{
echo -e “\n**********************************************”
echo -e “\n\n EXITING ON A TRAPPED SIGNAL...”
echo -e “\n\n**********************************************\n”
}
At the start of the MAIN section:
# Set a trap to exit. REMEMBER - CANNOT TRAP ON kill -9
trap ‘trap_exit; exit 2’ 1 2 3 15

Note the use the command exit 2 to indicate a forced exit

Define the following variables and assign to them the appropriate value
DATESTAMP is the current date/time in the following format “%h %d,%Y,%T”
SEARCH_PATH is the current directory (Top-level directory to search)

Display the following message on screen

Searching for Files Larger Than  xMb starting in:
/home/A2009XXXX
Please Standby for the Search Results...

Be sure to use the correct variables and parameters.

Searching for files
Use the find command to find all the files greater than xMB (the size of MB is passed from an argument) in your current directory.
Hint: in the man find out about –type, -size and –print
Redirect the output to a file (For example: results.out)

Test the size of the file to find out if there is anything inside of it
Hint: -s checks the size of a file

If the file is empty, display the following info on screen:
Nofiles were found that are larger than xMB
Exiting...

	If the file is not empty, then the file contains one line per file.
Count the number of lines in the file and display as follows:
Number of files found: 17

The output should display as follows:
Searching for Files Larger Than 1Mb Starting in:

/home/david/unit_8

Please Standby for the Search Results...

Date and time of Search: Dec12,2011,15:32:58

Number of Files Found: 3

These files were found:
/home/david/unit_8/CPU.JPG
/home/david/unit_8/findbigfiles
/home/david/unit_8/findbigfiles_new














Zip the script and upload it to Moodle