# Lonely Integer – Bash! HackerRank Solution

Hello coders, In this post, you will learn how to solve Lonely Integer – Bash! HackerRank Solution. This problem is a part of the Linux Shell series.

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## Lonely Integer – Bash! HackerRank Solution

### Problem

There are N integers in an array A. All but one integer occur in pairs. Your task is to find the number that occurs only once.

Input Format

The first line of the input contains an integer N, indicating the number of integers. The next line contains N space-separated integers that form the array A.

Constraints

1 <= N < 100

N % 2 = 1 (N is an odd number)

0 <= A[i] <= 100

Output Format

Output S, the number that occurs only once.

Sample Input:1

1
1

Sample Output:1

1

Sample Input:2

3
1 1 2

Sample Output:2

2

Sample Input:3

5
0 0 1 2 1

Sample Output:3

2

Explanation

In the first input, we see only one element (1) and that element is the answer.
In the second input, we see three elements; 1 occurs at two places and 2 only once. Thus, the answer is 2.
In the third input, we see five elements. 1 and 0 occur twice. The element that occurs only once is 2.

### Lonely Integer – Bash! HackerRank Solution

```#There are N integers in an array A. All but one integer occur in pairs. Your task is to find the number that occurs only once
arr=(\$(cat))
echo "\${arr[@]}" | tr ' ' '\n' |sort | uniq -u | tr '\n' ' '```

Note: This problem  (Lonely Integer – Bash!) is generated by HackerRank but the solution is provided by  chase2learn. This tutorial is only for Learning and Educational purpose.

### FAQ:

##### Bash and Linux Shell Practice on Hacker Rank

Bash and Linux Shell Practice. Learn and practice your Linux bash and text processing skills. The contest has ended. Speed. Accuracy. Efficiency.

##### Is it worth solving Linux Shell challenges in HackerRank?

Of course its worth . You might get some basic knowledge of for what kind of problem what command would be best .

##### What shell is in Linux?

sh – This is known as the Borne Shell and is the original shell; csh, tcsh – These are well-known and widely used derivatives of the Borne shell; ksh – The popular Korn shell; and. bash – The Borne Again SHell is the most popular shell used for linux and developed by GNU.

#### Where can I find HackerRank solutions in Linux Shell?

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Conclusion

Finally, we are now, in the end, I just want to conclude some important message for you

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