195. Tenth Line

Problem

Given a text file file.txt, print just the 10th line of the file.

Example:

Assume that file.txt has the following content:

Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 9
Line 10

Your script should output the tenth line, which is:

Line 10

Note:

1. If the file contains less than 10 lines, what should you output?
2. There's at least three different solutions. Try to explore all possibilities.

Solution

# Read from the file file.txt and output the tenth line to stdout.
sed -n 10p file.txt

Explain:

nope.

Complexity:

• Time complexity : O(n).
• Space complexity : O(n).