194. Transpose File

Problem

Given a text file file.txt, transpose its content.

You may assume that each row has the same number of columns, and each field is separated by the ' ' character.

Example:

If file.txt has the following content:

name age
alice 21
ryan 30

Output the following:

name alice ryan
age 21 30

Solution

# Read from the file file.txt and print its transposed content to stdout.
wordcount=$(head -1 file.txt | wc -w)
col_n=1
while [[ $col_n -le $wordcount ]]; do
    awk "{ print \$$col_n }" file.txt | paste -sd " "
    col_n=$((col_n + 1))
done

Explain:

nope.

Complexity:

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