Home Uncategorized Creating A GNU/Linux Bash Script For Monitoring And Logging System Activity

Uncategorized

Creating A GNU/Linux Bash Script For Monitoring And Logging System Activity

Specification

This report has been focused on developing a change logger script created in Ubuntu OS and managing of regular activity of user utilizing this system. Therefore, for creating shell script if the system, it is extracted from different shell command and output has been stored in the HTML file. IT would help in monitoring the system in a proper manner. The pre-installed command line tools for utilizing creation of shell script and output has been stored in a temporary log file for managing changes in the logs.

The shell script has been created using nano editor and named as “mySysMonitor.sh”, and proper permission has been added to the shell script for running it. Administrative permission has been required for running the shell script and “chmod +x mySysMonitor.sh” command has been utilized for giving appropriate permission and running shell script. “sudo ./mySysMonitor.sh”, command has been used for running the shell script as root user and generate the output in a HTML file.

The shell script has been designed for separating command for obtaining information and data for the development of change logger script. The prior function of the script has been monitoring current computer system and activity of user in order to develop log with a key. The script named “mySysMonitor.sh” has been automatically written in the log file named “mySysMonitor.log”. The output of the shell script has been stored in the HTML file and utilize “mySysMonitor.log” as temporary file for storing data and result of the command. The contents if the file has been copied in a temporary file and tail-f command has been used for comparing changes in the log file and identification has been made in the current system. For constructing the shell script the following commands are used such as:

1) Current Processes

echo “**********Current Process**********

$(ps -aux | sort -rk 3,3 | head -n 6)” >>mySysMonitor.log

current_processes_pid=`ps -ef | awk {‘print$2′} | cut -f2 -d’-‘`

current_processes_time=`ps -ef | awk {‘print$5′} | cut -f2 -d’-‘`

current_processes_process=`ps -ef | awk {‘print$8′} | cut -f2 -d’-‘`

2) Currently Logged in Users

echo ” **********Currently Logged in Users**********

$(who)” >>mySysMonitor.log

current_loggedin_user_name=`who | awk {‘print$1′} | cut -f1 -d’,’`

current_loggedin_user_date=`who | awk {‘print$3′} | cut -f1 -d’,’`

current_loggedin_user_time=`who | awk {‘print$4′} | cut -f1 -d’,’`

3) Plugged in Devices

echo ” **********Plugged in Devices**********

$(ls -l)” >>mySysMonitor.log

device_plugged_in_permissions=`ls -l /dev/ | awk {‘print$1’}`

device_plugged_in_UID=`ls -l /dev/ | awk {‘print$3’}`

device_plugged_in_number=`ls -l /dev/ | awk {‘print$6’}`

device_plugged_in_month=`ls -l /dev/ | awk {‘print$7’}`

device_plugged_in_date=`ls -l /dev/ | awk {‘print$8’}`

device_plugged_in_time=`ls -l /dev/ | awk {‘print$9’}`

device_plugged_in_disk=`ls -l /dev/ | awk {‘print$10’}`

4) Disk Usage

echo “**********Disk Usage**********

$(du -sh)” >>mySysMonitor.log

overall_disk_usage=`du -sh | tail -l | awk {‘print$1’}`

device_plugged_in_number=`ls -l /dev/ | awk {‘print$6’}`

home_directory_disk_usage=`du -sh /home7/P17245067 | tail -l | awk {‘print$1’}`

other_directory_disk_usage=`du -sh /home7/P17245067/Downloads | tail -l | awk {‘print$1’}`

5)Network Interfaces

echo “**********Network Interfaces**********

$(ip -s link)” >>mySysMonitor.log

network_interfaces_status=`ip -s link`

6)RAM Usage

echo “**********RAM Usage**********

Design Consideration

$(free -hm)” >>mySysMonitor.log

ram_usage=`free -hm | head -2 | tail -1 | awk {‘print$3’}`

ram_total=`free -hm | head -2 | tail -1 | awk {‘print$2’}`

7) Current Operating System Version

echo “**********Current Operating System Version**********

$(uname -r)” >>mySysMonitor.log

Current_os=`uname -r `

The shell script prepared for management of the change log is given below:

#! /bin/bash

#Author : – Kanan Patel

#Declaring variables

#set -x

1) Current Processes

echo “**********Current Process**********

$(ps -aux | sort -rk 3,3 | head -n 6)” >>mySysMonitor.log

current_processes_pid=`ps -ef | awk {‘print$2′} | cut -f2 -d’-‘`

current_processes_time=`ps -ef | awk {‘print$5′} | cut -f2 -d’-‘`

current_processes_process=`ps -ef | awk {‘print$8′} | cut -f2 -d’-‘`

2) Currently Logged in Users

echo ” **********Currently Logged in Users**********

$(who)” >>mySysMonitor.log

current_loggedin_user_name=`who | awk {‘print$1′} | cut -f1 -d’,’`

current_loggedin_user_date=`who | awk {‘print$3′} | cut -f1 -d’,’`

current_loggedin_user_time=`who | awk {‘print$4′} | cut -f1 -d’,’`

3) Plugged in Devices

echo ” **********Plugged in Devices**********

$(ls -l)” >>mySysMonitor.log

device_plugged_in_permissions=`ls -l /dev/ | awk {‘print$1’}`

device_plugged_in_UID=`ls -l /dev/ | awk {‘print$3’}`

device_plugged_in_number=`ls -l /dev/ | awk {‘print$6’}`

device_plugged_in_month=`ls -l /dev/ | awk {‘print$7’}`

device_plugged_in_date=`ls -l /dev/ | awk {‘print$8’}`

device_plugged_in_time=`ls -l /dev/ | awk {‘print$9’}`

device_plugged_in_disk=`ls -l /dev/ | awk {‘print$10’}`

4) Disk Usage

echo “**********Disk Usage**********

$(du -sh)” >>mySysMonitor.log

overall_disk_usage=`du -sh | tail -l | awk {‘print$1’}`

device_plugged_in_number=`ls -l /dev/ | awk {‘print$6’}`

home_directory_disk_usage=`du -sh /home7/P17245067 | tail -l | awk {‘print$1’}`

other_directory_disk_usage=`du -sh /home7/P17245067/Downloads | tail -l | awk {‘print$1’}`

5) Network Interfaces

echo “**********Network Interfaces**********

$(ip -s link)” >>mySysMonitor.log

network_interfaces_status=`ip -s link`

6)RAM Usage

echo “**********RAM Usage**********

$(free -hm)” >>mySysMonitor.log

ram_usage=`free -hm | head -2 | tail -1 | awk {‘print$3’}`

ram_total=`free -hm | head -2 | tail -1 | awk {‘print$2’}`

7)Current Operating System Version

echo “**********Current Operating System Version**********

$(uname -r)” >>mySysMonitor.log

Current_os=`uname -r `

Creating a directory if it doesn’t exist to store reports first, for easy maintenance.

if [ ! -d ${HOME}/Linux_System_Monitor ]

then

mkdir ${HOME}/Linux_System_Monitor

html=”${HOME}/Linux_System_Monitor/Linux-System-Monitor-`hostname`-`date +%y%m%d`-`date +%H%M`.html”

Generating HTML file

echo “” >> $html

echo “
” >> $html

echo “

” >> $html

echo “

” >> $html

echo “
” >> $html

echo “” >> $html

echo “

” >> $html

echo “

” >> $html

echo “Current Processes” >> $html

echo “” >> $html

echo “

” >> $html

echo “Logged in Users” >> $html

echo “” >> $html

echo “

” >> $html

echo “Plugged in Devices” >> $html

echo “” >> $html

echo “

” >> $html

echo “Disk Usage” >> $html

echo “” >> $html

echo “

” >> $html

Extensive Test Result and Exemplary Log and Screen Output

echo “Networks” >> $html

echo “” >> $html

echo “

” >> $html

echo “Ram Usage” >> $html

echo “” >> $html

echo “

” >> $html

echo “Current Operating System Version” >> $html

echo “” >> $html

echo “

” >> $html

echo “

” >> $html

echo “

” >> $html

echo “

” >> $html

echo “” >> $html

echo “PID” >> $html

echo “Starting Time” >> $html

echo “Processes” >> $html

echo “” >> $html

echo “$current_processes_pid” >> $html

echo “$current_processes_time” >> $html

echo “” >> $html

echo “

” >> $html

echo “

” >> $html

echo “

” >> $html

echo “

” >> $html

echo “” >> $html

echo “Username” >> $html

echo “From” >> $html

echo “Login Time” >> $html

echo “” >> $html

echo “$current_loggedin_user_name” >> $html

echo “$current_loggedin_user_date” >> $html

echo “$current_loggedin_user_time” >> $html

echo “” >> $html

echo “

” >> $html

echo “

” >> $html

echo “

” >> $html

echo “” >> $html

echo “Permissions” >> $html

echo “UID” >> $html

echo “Disk Number” >> $html

echo “Month” >> $html

echo “Date” >> $html

echo “time” >> $html

echo “Disk Name” >> $html

echo “” >> $html

echo “$device_plugged_in_permissions” >> $html

echo “$device_plugged_in_UID” >> $html

echo “$device_plugged_in_number” >> $html

echo “$device_plugged_in_month” >> $html

echo “$device_plugged_in_date” >> $html

echo “$device_plugged_in_time” >> $html

echo “$device_plugged_in_disk” >> $html

echo “” >> $html

echo “

” >> $html

echo “

” >> $html

echo “

” >> $html

echo “” >> $html

echo “Overall Disk Size” >> $html

echo “” >> $html

echo “$overall_disk_usage” >> $html

echo “” >> $html

echo “

” >> $html

echo “

” >> $html

echo “” >> $html

echo “Home Directory Size” >> $html

echo “” >> $html

echo “$home_directory_disk_usage” >> $html

echo “” >> $html

echo “

” >> $html

echo “

” >> $html

echo “” >> $html

echo “Other Directory Disk Size” >> $html

echo “” >> $html

echo “$other_directory_disk_usage” >> $html

echo “” >> $html

echo “

” >> $html

echo “

” >> $html

echo “

$network_interfaces_status

” >> $html

echo “” >> $html

echo “

” >> $html

echo “

” >> $html

echo “

” >> $html

echo “” >> $html

echo “Used RAM Size” >> $html

echo “” >> $html

echo “$ram_usage” >> $html

echo “” >> $html

echo “Total RAM Size” >> $html

echo “” >> $html

echo “$ram_total” >> $html

echo “” >> $html

echo “

” >> $html

echo “

Current Operating System Version

” >> $html

echo “

$Current_os

” >> $html

echo “” >> $html

Conclusion

The creation of shell script helps in reducing effort of the network engineer for monitoring and managing activity of user. The shell script has been executed for getting all information about the current system with the help of using a single command. There are some disadvantages as the speed is slower when the shell script is compared with several programming language for monitoring the activity of current user and managing changes made in the system.

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