leetcode194. Transpose File

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.

For example, if file.txt has the following content:

name age
alice 21
ryan 30

Output the following:

name alice ryan
age 21 30

solution

#!/bin/bash
awk '
{
    for(i=1;i<=NF;i++){
        if(NR==1){
            s[i]=$i;
        }
        else{
            s[i]=s[i]" "$i;
        }
    }
}
END{
    for(i=1;s[i]!="";i++){
        print s[i];
    }
}
' file.txt