Task A (scan tcp/ip)

Create a script that uses the following keys:

1. When starting without parameters, it will display a list of possible keys and their description

2. The --all key displays the IP addresses and symbolic names of all hosts in the current subnet

3. The --target key displays a list of open system TCP ports.The code that performs the functionality of each of the subtasks must be placed in a separate function+

#!/bin/bash

ping_curr_subN() {
	nmap -n -sP 192.168.1.0/24 > ip_logs
}

scan_ports() {
	nmap -p- 192.168.1.1 > ports_logs
	nmap -p- 127.0.0.1 >> ports_logs  
}

default=true

for arg; do
	case "$arg" in
		--all)
			ping_curr_subN 
			default=false
			;;
		--target) 
			scan_ports
			default=false
			;;
		*) echo "ERROR invalid input" ;;
	esac
done


if $default ; then
	echo "--all     do something"
	echo "--target  do another thing"	
fi

Task B (scan logs)

Using Apache log example create a script to answer the following questions:

1. From which ip were the most requests?

2. What is the most requested page?

3. How many requests were there from each ip?

4. What non-existent pages were clients referred to?

5. What time did site get the most requests?

6. What search bots have accessed the site? (UA + IP)

#!/bin/bash

#1 
awk '{ print $0  }' example_logs | grep -oP '((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}' | sort -n | uniq -c | sort -nr | head -1 > result_logs
awk '{ new_var="1) the most requested ip: "$2; print new_var }' result_logs > ip_counter


#2
awk '{ print $0  }' example_logs | grep -oP ' \/[^\.]*\.html' | sort | uniq -c | sort -nr | head -1 > result_logs
awk '{ new_var="2) the most requested page: "$2; print new_var }' result_logs >> ip_counter


#3
echo "3)" >> ip_counter
printf "Count   IP\n" >> ip_counter
awk '{ print $0  }' example_logs | grep -oP '((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}' | sort -n | uniq -c | sort -nr >> ip_counter
sed -n "/ 404 /p" example_logs > result_logs


#4
echo "4)" >> ip_counter
awk '{ print $0  }' example_logs | grep -oP '(GET|POST|PUT|DELETE) .* 404' >> ip_counter


#5
awk '{ print $0  }' example_logs | grep -oP '\[[^\[]*\+[^\[]*\]' > result_logs 
sed -ie 's/:/ /g' result_logs 
awk '{ print $2 }' result_logs | sort | uniq -c | sort -nr | head -1 > result_logs 
awk '{ new_var="5) the most requested time: "$2; print new_var  }' result_logs >> ip_counter


#6
sed -n '/ [^ ]*[Bb][Oo][Tt]\/.*;/p' example_logs > result_logs 
awk '{ print $0  }' example_logs | grep -oP '((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}.* [^ ]*[Bb][Oo][Tt]\/.*;' > result_logs
echo "6)" >> ip_counter
awk '{ print $1" "$NF  }' result_logs | sort -n  | uniq | sort -nr >> ip_counter


# Remove the leftover files
rm result_logs

Task C (create a data backup)

Create a data backup script that takes the following data as parameters:

1. Path to the syncing directory.

2. The path to the directory where the copies of the files will be stored.

3. In case of adding new or deleting old files, the script must add a corresponding entry to the log file indicating the time, type of operation and file name. The command to run the script must be added to crontab with a run frequency of one minute

#!/bin/bash

#1
dir_path="$1"
echo $dir_path


#2
save_path="$2"
echo $save_path


#3 Create archive filename.
backup_date=$( date | tr " " _)
echo $backup_date
hostname=$(hostname -s)
archive_file="$hostname$backup_date.tgz"
echo $archive_file


# Backup the files using tar
find $dir_path -mmin -1 -print0 | xargs -0 tar fcz $save_path/$archive_file --absolute-names


# cron 
# * * * * * bash t_b_3 /home/user_name/path_of_data /home/user_name/dir_to_backup