Interview Questions and Answers

All Interview Questions and Answers

Shell Script Questions

1. Find Second Largest and Second Smallest and Add

arr=(12 13 3 4 1 6 9 17 13)
unique_arr=($(echo "${arr[@]}" | tr ' ' '\n' | sort -n | uniq))
second_smallest=${unique_arr[1]}
second_largest=${unique_arr[-2]}
sum=$((second_smallest + second_largest))
echo "Sum: $sum"

2. Reverse a String

reverseStr() {
  local str="$1"
  echo "$str" | rev
}

doTestsPass() {
  local result=0

  if [[ "$(reverseStr 'abcd')" == "dcba" ]]; then result=$((result + 1)); fi
  if [[ "$(reverseStr 'odd abcde')" == "edcba ddo" ]]; then result=$((result + 1)); fi
  if [[ "$(reverseStr 'even abcde')" == "edcba neve" ]]; then result=$((result + 1)); fi
  if [[ "$(reverseStr "$(reverseStr 'no change')")" == "no change" ]]; then result=$((result + 1)); fi
  if [[ "$(reverseStr '')" == "" ]]; then result=$((result + 1)); fi

  if [[ $result -eq 5 ]]; then
    echo "All tests pass"
  else
    echo "There are test failures"
  fi
}

doTestsPass

3. Find Unique Characters and Print Longest Possible Substring

input="tisishatrecupttt"
declare -A freq
for ((i=0; i<${#input}; i++)); do
  char="${input:$i:1}"
  freq[$char]=$(( ${freq[$char]} + 1 ))
done

unique=""
for c in $(echo ${!freq[@]}); do
  if [[ ${freq[$c]} -eq 1 ]]; then
    unique+=$c
  fi
done

echo "Unique characters substring: $unique"

4. Print Line 50 to 60 of a File

sed -n '50,60p' filename.txt

5. Search Pattern and Count Frequency

grep -o 'pattern' filename.txt | wc -l

6. Shell Script: Palindrome Check

str="$1"
rev_str=$(echo "$str" | rev)
if [[ "$str" == "$rev_str" ]]; then
  echo "Palindrome"
else
  echo "Not Palindrome"
fi

7. Check File Exists and Size and Send Email

if [[ -f "$file" ]]; then
  if [[ $(stat -c%s "$file") -gt 0 ]]; then
    echo "File exists and not empty" | mail -s "File Alert" user@example.com
  fi
fi

8. Delete Blank Lines in a File

sed -i '/^$/d' filename.txt

9. AWK: Print Lines Greater Than Length 5

awk 'length($0) > 5' filename.txt

10. Print Last 10 Lines

tail -n 10 filename.txt

AutoSys Related Questions

On Hold vs On Ice

• On Hold: Job will not run until manually released. Successor jobs do not run.
• On Ice: Job will not run but successors can run as if it succeeded.

JIL File

Job Information Language (JIL) is used to define AutoSys jobs with attributes such as command, machine, owner, start times, etc.

Predecessor/Successor Concept

Predecessor: Job that must finish before another can start.
Successor: Job that depends on the predecessor.

Job Schedule

Defined using "start_times", "days_of_week", "run_calendar" attributes in AutoSys.

Java and Python Coding

1. Find Odd and Even Numbers

int[] arr = {2, 3, 4, 5, 6, 3, 7};
for (int num : arr) {
    if (num % 2 == 0) System.out.println(num + " Even");
    else System.out.println(num + " Odd");
}

2. Kill Process Problem

Map<Integer, List<Integer>> tree = new HashMap<>();
for (int i = 0; i < ppid.length; i++) {
    tree.computeIfAbsent(ppid[i], k -> new ArrayList<>()).add(pid[i]);
}

Queue<Integer> queue = new LinkedList<>();
queue.add(kill);
while (!queue.isEmpty()) {
    int current = queue.poll();
    result.add(current);
    if (tree.containsKey(current)) {
        queue.addAll(tree.get(current));
    }
}

3. Find Frequency of Characters

String s = "abcdascgab";
Map<Character, Integer> freq = new HashMap<>();
for (char c : s.toCharArray()) {
    freq.put(c, freq.getOrDefault(c, 0) + 1);
}

4. Remove Lines with Null 6th Field

BufferedReader reader = new BufferedReader(new FileReader("input.txt"));
BufferedWriter writer = new BufferedWriter(new FileWriter("output.txt"));
String line;
while ((line = reader.readLine()) != null) {
    String[] fields = line.split(",");
    if (fields.length >= 6 && fields[5] != null && !fields[5].isEmpty()) {
        writer.write(line);
        writer.newLine();
    }
}
reader.close();
writer.close();

Conceptual Questions

Git

• Rebase: Reapply commits on top of another branch.
• Merge Conflict: Happens when two branches changed same line; resolve manually and commit.

Unix

• AWK: Text processing and extraction tool.
• Extract 20th line: sed -n '20p' filename.txt

SDLC Process

Phases: Planning, Analysis, Design, Development, Testing, Deployment, Maintenance.

CI/CD Pipeline

Build - Test - Deploy automatically on code changes using tools like Jenkins, GitHub Actions, etc.

Logical Questions

1. Dot Product of Two Arrays

int[] a = {1, 2, 3};
int[] b = {4, 5, 6};
int result = 0;
for (int i = 0; i < a.length; i++) result += a[i] * b[i];

2. Print Integers from String

String input = "a1b2c3";
for (char c : input.toCharArray()) {
    if (Character.isDigit(c)) System.out.print(c + " ");
}