traverse_directory.sh

#write the shell script for the following.
#In a directory contains six sub directories called a,b,c,d,e,f.
#Go to each directory and read the files contained in a directory one by one and
#check the below three conditions.
#a. If we received a file today, then check file is corrupted or not.
#b. Find the average file size of the last 30 days and compare with today's file size.If there is a deviation in file size +/- by 20% then send a mail.
#c. If today's File Time difference is more or less than 2 hours compared with the average time of the last 30 days then send a mail.

#!/bin/bash

#script to recursively travel a dir of n levels

DIRECTORY_LIST=("a" "b" "c" "d" "e" "f")
TODAY=`date '+%b %e'`
REPORT_NAME='/tmp/report.txt'
function traverse() {
for directory in ${DIRECTORY_LIST[@]}
do
    echo "directory ${1}/${directory}"
    echo "$(pwd)"
    echo $TODAY
    if [[ -d ${1}/${directory} ]]; then
        #logic
        if [ "$(ls -A ${1}/${directory})" ]; then
            cd ${1}/${directory}
            echo $(pwd)
            echo $(ls -ltr)
            echo $TODAY
            if [ "$(ls -ltr | grep -i "$TODAY")" ]; then
                echo "entered"
		name=`ls -ltr | grep -i "$TODAY" | awk '{print $9}'`
		untar_file=`tar -xvzf $name -O`
		if [ $? -eq 0 ]; then
    			echo "file is not corrupted"
			#find average file size
			average_size=$(find $(pwd) -type f -mtime -30 -ls |  awk '{sum += $7; n++;} END {print sum/n;}')
			average_time=$(find $(pwd) -type f -mtime -30 -ls | awk '{print  $10}' | awk '{split($0, a, ":"); sum += a[1]; n++;} END {print sum/n;}')
			today_file_size=$(ls -l | grep -v 'total'| awk '{print $5}')
			today_file_time=$(ls -l | grep -v 'total'| awk '{print $8}' |awk '{split($0, a, ":"); print a[1]}')
			size_deviation=$(echo $average_size*0.2| bc)
			time_deviation=2
			int_size_deviation=$( printf "%.0f" $size_deviation )
			max_size=$(($average_size + $int_size_deviation))
			min_size=$(($average_size - $int_size_deviation))
			max_time=$(($average_time + $time_deviation))
			min_time=$(($average_time - $time_deviation))
			if [[ $today_file_size -ge $max_size ]] || [[ $today_file_size -le $min_size ]]; then
				echo "Size of file not met defined criteria , $name in directory $directory" >> $REPORT_NAME
			else
				echo "do nothing"
			fi
			if [[ 10#$today_file_time -ge  $max_time ]] || [[ 10#$today_file_time -le $min_time ]]; then
				echo "time of file not met defined criteria , $name in directory $directory" >> $REPORT_NAME
			else
				echo "do nothing"
			fi
		else
    			echo "file corrupted :  $name, in directory:  $directory" >> $REPORT_NAME
		fi
            else
                echo "no file arrived in $directory" > file.txt
            fi
            cd ../..
        else
            echo "${1}/${directory} is Empty take action" >> $REPORT_NAME
        fi
    else
        echo "found a file with same name , skipping file ${1}/${directory}"
    fi
done
}

function send_mail() {
subject="System logs Status Alert"
##sending mail as
from="server.monitor@example.com"
## sending mail to
to="admin1@example.com"
## send carbon copy to
also_to="admin2@example.com"
## send email
echo "sending email..." | mailx -a "$REPORT_NAME" -s "$subject" -r "$from" -c "$to" "$also_to"
}

function main() {
    traverse "$1"
}

main "$1"