TASKS

Task 1

Develop a script that takes a string as an argument and returns its reverse version, changing uppercase letters to lowercase and back

Check

./loops1.sh "Hello World"

DLROw OLLEh

./loops1.sh "bash"

HSAB

./loops1.sh "EPAM"

mape

#!/bin/bash

# Put your code here
str="$1"
res=""

for((i=0; i < ${#str}; i++)); do
    char="${str:i:1}"
    if [[ $char =~ [A-Z] ]]; then
        res="${char,,}"$res
    elif [[ $char =~ [a-z] ]]; then
        res="${char^^}"$res
    else
        res="$char"$res
    fi
done

echo $res

Task 2

An unsorted list is passed to the script. Write a program that will output the sum of even numbers

Check

./cond1.sh "1,2,3,4,5,6,7"

12

./cond1.sh "4,3,1"

4

./cond1.sh "2,2,9,3,8"

12

./cond1.sh ""

0

#!/bin/bash

IFS=',' read -r -a arr <<< "$1"
arr_size=${#arr[@]}
if [[ arr_size == 0 ]]; then
    echo 0
    exit 0
fi

sum=0
for((i=0; i < arr_size; i++)); do
    if (( arr[i] % 2 == 0 )); then
        sum=$(( arr[i] + sum ))
    fi
done

echo $sum

Task 3

Develop a script that takes the temperature value in Celsius OR Kelvins and returns the inverse value. The formula is pretty simple: C = K - 273; K = C + 273

Check

./temp.sh 55C

328K

./temp.sh 122K

• 151C

./temp.sh 98C

371K

#!/bin/bash

str="$1"

if [[ ${str: -1} == "C" ]]; then
    echo "$(( ${str:0:-1} + 273 ))K"
else
   echo "$(( ${str:0:-1} - 273 ))C"
fi

Task 4

Develop script that takes any string and calculate count of letters, numbers, symbols *!@#$%^&()_+ inside except whitespaces

Check

./check_string.sh "Hello ! ** 564gfhf"

Numbers: 3 Symbols: 3 Letters: 9

./check_string.sh "Hello ! +"

Numbers: 0 Symbols: 2 Letters: 5

./check_string.sh "Hello !!"

Numbers: 0 Symbols: 2 Letters: 5

#!/bin/bash

# Place your code here
nums=0
chars=0
sym=0

str2="$1"

for (( i=0; i < ${#str2}; i++ )); do
    ch="${str2:i:1}"
    if [[ $ch =~ [A-Za-z] ]]; then
        (( chars++ ))
    elif [[ $ch =~ [\*!\@\#\$%\^\&()_+] ]]; then
        (( sym++ ))
    elif [[ $ch =~ [0-9] ]]; then
        (( nums++ ))
    else
      continue;
    fi
done

echo "Numbers: $nums Symbols: $sym Letters: $chars"

Task 5 : Pow Task

Develop a pow() function that takes two arguments (a, b) and raises the first argument to the power of the second (a^b).

Check

pow 2 3 8

pow 2 5 32

#!/bin/bash

function pow() {
    x=$1
    y=$2
    echo $(( x ** y ))
}

echo $(pow 2 3) # 8

Task 6 : Shortest string function

Develop the shortest() function, which can take an unlimited number of arguments(strings) and output the shortest argument.

Check

shortest "This" "is" "Bash" "Functions" "Task" is

If there are more than two arguments, output each string on a new line. In an order they are passed to function.

shortest "Java" "Bash" "Python" Java Bash

function shortest() {
    # Step 1: find minimum length
    min_len=${#1}
    for i in "$@"; do
        if (( ${#i} < min_len )); then
            min_len=${#i}
        fi
    done

    # Step 2: print all strings with min length
    for i in "$@"; do
        if (( ${#i} == min_len )); then
            echo "$i"
        fi
    done
}

echo $(shortest "Java" "Bash" "Python") # Java Bash

Task 7 : Log function

Develop a print_log() function that takes a string as an argument and outputs the same string with the date at the beginning. In order for the automatic check to work, the string must be in this format: YEAR-MONTH-DAY HOUR:MINUTES

Check

print_log "Hello World!" [2022-05-10 13:04] Hello World!

print_log "Hello Bash!" [2022-05-10 13:10] Hello Bash!

function print_log() {
    echo "["$(date +"%Y-%m-%d %H:%M")"] $1"
}

echo $(print_log "Hello Bash!") # [2022-05-10 13:10] Hello Bash!

Task 8

Develop a script that takes number (count of needed folders up to 26) as an argument and create this folders in current directory with next naming convention folder_<[a-z]>.

Check

./array.sh 5

5 folders created: folder_a, folder_b, folder_c, folder_c, folder_d

./array.sh 1

1 folder created: folder_a

./array.sh 2

2 folders created: folder_a, folder_b

#!/bin/bash

num=$1

for (( i = 0; i < $num; i++ )); do
   char=$(printf "\\$(printf '%03o' "$((97+i))")")
    mkdir "folder_$char"
done

Task 9: Log Parsing

Write a Bash script that reads a log file named sys_logs.log line by line.

For each line:

• If both of the following fields exist:
  • endpoint
  • ResponseTime

Then print a simplified output containing only these two fields in the format:

Endpoint=<endpoint_value> ResponseTime=<response_time_value>ms

Example Input File (sys_logs.log)

[2026-03-06T10:01:02Z] endpoint=/api/v1/users ResponseTime=120ms Code=200 IP=192.168.1.10
[2026-03-06T10:01:05Z] endpoint=/api/v1/orders Code=201 IP=192.168.1.11
[2026-03-06T10:01:08Z] endpoint=/api/v1/products ResponseTime=95ms Code=200 IP=192.168.1.12
[2026-03-06T10:01:11Z] ResponseTime=310ms Code=200 IP=192.168.1.20

#!/bin/bash

while read line
do
    if [[ $line =~ **endpoint=([^[:space:]]+)** ]]; then
        endpoint="${BASH_REMATCH[1]}"
    else
        continue
    fi

    if [[ $line =~ **ResponseTime=([0-9]+)ms** ]]; then
        time="${BASH_REMATCH[1]}"
    else
        continue
    fi

    echo "Endpoint=$endpoint ResponseTime=${time}ms"
done < **sys_logs.log**