Homework Assignment 1

Network Administration

link

System Administration

format_check.sh

#! /usr/bin/env bash

date_patterns=('^[0-9]{4}-[0-9]{2}-[0-9]{2}$'
               '^[0-9]{4}/[0-9]{2}/[0-9]{2}$'
               '^[0-9]{4}\.[0-9]{2}\.[0-9]{2}$')
time_patterns=('^[0-9]{2}:[0-9]{2}$'
               '^[0-9]{2}:[0-9]{2}:[0-9]{2}$')

date_is_valid=0
time_is_valid=0

for pattern in ${date_patterns[@]}; do
    if [ `echo "$1" | grep -cE "$pattern"` -eq 1 ]; then
        date_is_valid=1
    fi
done

for pattern in ${time_patterns[@]}; do
    if [ `echo "$2" | grep -cE "$pattern"` -eq 1 ]; then
        time_is_valid=1
    fi
done

if [ $date_is_valid != 0 ] && [ $time_is_valid != 0 ]; then
    echo "$1 $2"
else
    echo "Invalid"
fi

rtt_test.sh

#! /usr/bin/env bash

output_str=''
url_list=`cat $1 | grep '^#Server = ' | cut -d ' ' -f 3`

for url in $url_list
do
    ping_result=`ping -c 3 -q "$url" 2>&1`
    #if [ `echo "$ping_result" | grep -E -c "not known|Unknown host|100% packet loss"` == '0' ]
    if [ $? -eq 0 ]
    then
        rtt=`echo "$ping_result" | grep rtt | cut -d ' ' -f 4 | cut -d '/' -f 2`
        output_str="$output_str$url $rtt\n"
    fi
done

printf "${output_str}" | sort -g -k 2

csie_analytics.sh

#! /usr/bin/env bash

N=10

usage() {
    echo "Usage: csie_analytics.sh [-n count] [filename]:"
}

if [ $# -eq 0 ]; then
    usage  # lack file name
    exit 5
fi

if [ "$1" == "-n" ]; then
    if [ $# -eq 2 ]; then
        if [ -f "$2" ]; then   # example: ./csie_analytics.sh -n log.txt
            echo "Error: option requires an argument."
            exit 1 
        else  # example: ./csie_analytics.sh -n 8
            usage
            exit 5
        fi
    elif [ `echo "$2" | grep -c "^[1-9][0-9]*$"` -eq 0 ]; then  # example: ./csie_analytics.sh -n 11.7 log.txt
        echo "Error: line number must be positive integer."
        exit 2
    else  # correct: ./csie_analytics -n 42 log.txt
        FILENAME=$3
        N=$2
    fi
elif [ `echo "$1" | grep -c -- '-.*'` -ne 0 ] || [ $# -gt 1 ]; then  # example: ./csie_analytics.sh -q ... || ./csie_analytics.sh log.txt -n 999
    usage  # Other arguments error
    exit 3
else
    FILENAME="$1"  # correct or file not exists
fi

if [ ! -f "$FILENAME" ]; then
    echo "Error: log file does not exist."
    exit 4
fi

data=`cat $FILENAME | cut -d ' ' -f 5 | sed 's/?[^ ]*//g' | sort | uniq -c | sort -gr -k 1`
sum=`cat "$FILENAME" | wc -l`

echo "$data" | head -n $N | awk -v sum="$sum" 'BEGIN{printf "%-35s %-10s %s\n", "Path", "Times", "Percentage"} {percentage = $1 / sum * 100; printf "%-35s %-10s %-2.2f%%\n", $2, $1, percentage}'