题目描述：

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

题目大意：

给定一个文本文件file.txt，将其内容进行转置。

你可以假设每行包含的列数相同，每一个字段都由' '字符隔开。

例如，如果file.txt包含下面的内容：

name age
alice 21
ryan 30

输出下面的内容：

name alice ryan
age 21 30

Bash脚本：

# Read from the file file.txt and print its transposed content to stdout.
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

参考LeetCode Discuss：https://leetcode.com/discuss/29462/ac-solution-using-awk-and-statement-just-like-c

本文链接：http://bookshadow.com/weblog/2015/03/28/leetcode-transpose-file/
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