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

awk '

{

    for (i=1; i<=NF; i++)  {

        a[NR,i] = $i

    }

}

NF>p { p = NF }

END {

    for(j=1; j<=p; j++) {

        str=a[1,j]

        for(i=2; i<=NR; i++){

            str=str" "a[i,j];

        }

        print str

    }

}' file.txt

http://*.com/questions/1729824/transpose-a-file-in-bash

领悟：

1、awk中二位数组的定义

2、循环控制的上线（NR，NF）

3、awk中的链接操作，直接将几个变量并排写就是一个新变量