thomas-george-t / hackerrank-the-linux-shell-challenges-solutions

Complete Solutions and related tutorials for the Linux Shell - Bash, text processing, Arrays in Bash, Grep Sed Awk Challenges on HackerRank

Description

Solutions to all the easy, medium and hard challenges compiled with related learning resources for the Linux Shell Challenges on HackerRank.

Domains included:

• Bash Challenges
• Text Processing
• Arrays in Bash
• Grep Sed Awk

Bash Challenges

Number	Challenges	Solutions
1	Let's Echo!	Solution.sh
2	Looping and Skipping	Solution.sh
3	A Personalized Echo	Solution.sh
4	Looping with numbers	Solution.sh
5	The World of Numbers	Solution.sh
6	Comparing Numbers	Solution.sh
7	Getting started with conditionals	Solution.sh
8	More on Conditionals	Solution.sh
9	Arithmetic Operations	Solution.sh
10	Compute the Average	Solution.sh
11	Functions and Fractals - Recursive Trees - Bash!	Solution.sh

Text Processing

Number	Challenge	Solutions
1	Cut #1	Solution
2	Cut #2	Solution
3	Cut #3	Solution
4	Cut #4	Solution
5	Cut #5	Solution
6	Cut #6	Solution
7	Cut #7	Solution
8	Cut #8	Solution
9	Cut #9	Solution
10	Head of a Text File #1	Solution
11	Head of a Text File #2	Solution
12	Middle of a Text File	Solution
13	Tail of a Text File #1	Solution
14	Tail of a Text File #2	Solution
15	'Tr' Command #1	Solution
16	'Tr' Command #2	Solution
17	'Tr' Command #3	Solution
18	Sort Command #1	Solution
19	Sort Command #2	Solution
20	Sort Command #3	Solution
21	Sort Command #4	Solution
22	Sort Command #5	Solution
23	Sort Command #6	Solution
24	Sort Command #7	Solution
25	'Uniq' Command #1	Solution
26	'Uniq' Command #2	Solution
27	'Uniq' Command #3	Solution
28	'Uniq' Command #4	Solution
29	Paste - 1	Solution
30	Paste - 2	Solution
31	Paste - 3	Solution
32	Paste - 4	Solution

Arrays in Bash

Number	Challenge	Solutions
1	Read in an Array	Solution
2	Slice an Array	Solution
3	Filter an Array with Patterns	Solution
4	Concatenate an array with itself	Solution
5	Display an element of an array	Solution
6	Count the number of elements in an Array	Solution
7	Remove the First Capital Letter from Each Element	Solution
8	Lonely Integer - Bash!	Solution

Grep Sed Awk

Number	Challenge	Solutions
1	'Grep' #1	Solution
2	'Grep' #2	Solution
3	'Grep' #3	Solution
4	'Grep' -A	Solution
5	'Grep' -B	Solution
6	'Sed' command #1	Solution
7	'Sed' command #2	Solution
8	'Sed' command #3	Solution
9	'Sed' command #4	Solution
10	'Sed' command #5	Solution
11	'Awk' - 1	Solution
12	'Awk' - 2	Solution
13	'Awk' - 3	Solution
14	'Awk' - 4	Solution

Featured in

• lib4dev.in

References, Tutorials and Relevant Materials

General

• Shell Scripting video tutorial

Bash

• Refresher to Bash
• Quick guide to shell scripts
• Catching user input
• Loops in Bash

Text Processing

• Cut
• Head
• Tr video
• Sort
• Uniq video
• Uniq
• Paste video
• Paste

Arrays in Bash

• Array Tutorial

hackerrank-the-linux-shell-challenges-solutions's Issues

linux-shell-tutor

[Solution]: Functions and Fractals - Recursive Trees - Bash!

Hello! ✌

I started learning Shell Scripting and started practicing at Hackerrank and while practicing questions I stuck at Functions and Fractals question and google search to get the idea of solution I found your repo as my first result!

As a beginner who started learning Shell scripting, I found your this repository very helpful, each command I first learning from youtube & when stuck I reach out to this repository.

The mentioned question does not have a solution, nor I could solve it, I found an answer, and want to contribute to this repository with the solution I got.

declare -A a

# credits to https://github.com/MaskRay/HackerRank/blob/master/shell/fractal-trees-all.sh
# d - depth
# l = length
# r = row
# c = column

f() {
    local d=$1 l=$2 r=$3 c=$4
    [[ $d -eq 0 ]] && return
    for ((i=l; i; i--)); do
        a[$((r-i)).$c]=1
    done
    ((r -= l))
    for ((i=l; i; i--)); do
        a[$((r-i)).$((c-i))]=1
        a[$((r-i)).$((c+i))]=1
    done
    f $((d-1)) $((l/2)) $((r-l)) $((c-l))
    f $((d-1)) $((l/2)) $((r-l)) $((c+l))
}
read n
f $n 16 63 49
for ((i=0; i<63; i++)); do
    for ((j=0; j<100; j++)); do
        if [[ ${a[$i.$j]} ]]; then
            printf 1
        else
            printf _
        fi
    done
    echo
done

I hope this adds a complete mark to your repository and it will eventually help people in the community!

About 'Sed' command #1.sh Solution

Your solution: $ sed -e 's/the /this /1'
It showing error.
After then i done this like this sed -e 's/<the>/this/'