enevales/s21_linux_monitoring

Linux basic bash scripting and system research.

Linux_monitoring

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Contents:

• Introduction
• Details
• Tasks
  • First effort
  • System research
  • Visual output design for the system research script
  • Configuring visual output design for the system research script.
  • File system research

Introduction:

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An educational project designed to familiarize us with Linux basic bash scripting and system research.

Details:

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• The written bash scripts are in the src folder
• For each task there is a folder with the following name: 0x, where x is the task number.
• The main script file for each task is named main.sh
• All scripts have checks for incorrect input (not all parameters specified, wrong format parameters, etc.)
• All scripts are tested on a virtual machine Ubuntu Server 20.04 LTS

Tasks:

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Part 1. First effort

Write a bash script. The script is run with one parameter. It is a text parameter.
The script outputs the value of the parameter.
If the parameter is a number, the script must output an invalid input message.

Part 2. System research

Write a bash script. The script should output the following information:

HOSTNAME = network name
TIMEZONE = time zone as: America/New_York UTC -5 (time zone must be taken from the system and be correct for the current location)
USER = current user who ran the script
OS = type and version of operating system
DATE = current time as: 12 May 2020 12:24:36
UPTIME = system uptime
UPTIME_SEC = system uptime in seconds
IP*= _ip address of the machine on any of the network interfaces
MASK = network mask of any of the network interfaces as: xxx.xxx.xxx.xxx.
GATEWAY = default gateway ip
RAM_TOTAL = main memory size in GB with an accuracy of three decimal places as: 3.125 GB
RAM_USED = used memory size in GB with an accuracy of three decimal places
RAM_FREE = free memory size in GB, with an accuracy of three decimal places
SPACE_ROOT = root partition size in MB, with an accuracy of two decimal places, as 254.25 MB
SPACE_ROOT_USED = size of used space of the root partition in MB, with an accuracy of two decimal places
SPACE_ROOT_FREE = size of free space of the root partition in MB, with an accuracy of two decimal places

After outputting the values, suggest writing the data to a file (ask the user to answer Y/N).
Responses Y and y are considered positive, all others - negative.

If the user agrees, create a file in the current directory containing the information that had been outputted. The file name must looks like: DD_MM_YY_HH_MM_SS.status (The time in the file name must indicate when the data was saved).

Part 3. Visual output design for the system research script

Write a bash script. Use the script from Part 2 and remove the part where the data is saved to a file. The script is run with 4 parameters. The parameters are numeric. From 1 to 6, for example:
script03.sh 1 3 4 5

Colour designations: (1 - white, 2 - red, 3 - green, 4 - blue, 5 - purple, 6 - black)

Parameter 1 is the background of the value names (HOSTNAME, TIMEZONE, USER etc.)
Parameter 2 is the font colour of the value names (HOSTNAME, TIMEZONE, USER etc.)
Parameter 3 is the background of the values (after the '=' sign)
Parameter 4 is the font colour of the values (after the '=' sign)

The font and background colours of one column must not match.
If matching values are entered, there must be a message describing the problem and offering to call the script again. After the message output, the program should exit correctly.

Part 4. Configuring visual output design for the system research script

Write a bash script. Use the script from Part 3. The colour designations are similar. The script runs without parameters. The parameters are set in the configuration file before the script is running.

This is how the configuration file must look like:

column1_background=2
column1_font_color=4
column2_background=5
column2_font_color=1

If one or more parameters are not set in the configuration file, the colour must be substituted from the default colour scheme. (Choice is at the developer's discretion).

After the system information output from Part 3, you should output the colour scheme by indenting one empty line as follows:

Column 1 background = 2 (red)
Column 1 font color = 4 (blue)
Column 2 background = 5 (purple)
Column 2 font color = 1 (white)

When running the script with the default colour scheme, the output should look like this:

Column 1 background = default (black)
Column 1 font color = default (white)
Column 2 background = default (red)
Column 2 font color = default (blue)

Part 5. File system research

Write a bash script. The script is run with a single parameter.
The parameter is an absolute or relative path to a directory. The parameter must end with '/', for example:
script05.sh /var/log/

The script must output the following information about the directory specified in the parameter:

• Total number of folders, including subfolders
• Top 5 folders with largest size in descending order (path and size)
• Total number of files
• Number of configuration files (with .conf extension), text files, executable files, log files (files with .log extension), archives, symbolic links
• Top 10 files with largest size in descending order (path, size and type)
• Top 10 executable files with largest size in descending order (path, size and hash)
• Execution time of the script

The script should output the following information:

Total number of folders (including all nested ones) = 6  
TOP 5 folders of maximum size arranged in descending order (path and size):  
1 - /var/log/one/, 100 GB  
2 - /var/log/two/, 100 MB  
etc up to 5
Total number of files = 30
Number of:  
Configuration files (with the .conf extension) = 1 
Text files = 10  
Executable files = 5
Log files (with the extension .log) = 2  
Archive files = 3  
Symbolic links = 4  
TOP 10 files of maximum size arranged in descending order (path, size and type):  
1 - /var/log/one/one.exe, 10 GB, exe  
2 - /var/log/two/two.log, 10 MB, log  
etc up to 10  
TOP 10 executable files of the maximum size arranged in descending order (path, size and MD5 hash of file)  
1 - /var/log/one/one.exe, 10 GB, 3abb17b66815bc7946cefe727737d295  
2 - /var/log/two/two.exe, 9 MB, 53c8fdfcbb60cf8e1a1ee90601cc8fe2  
etc up to 10  
Script execution time (in seconds) = 1.5

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All tasks were provided by School21