LeetCode刷题实战194：转置文件
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.
题意
示例
示例:
假设 file.txt 文件内容如下：
name age
alice 21
ryan 30
应当输出：
name alice ryan
age 21 30
解题
思路：先用awk获取列数，再循环
k=`awk '{print NF}' file.txt | head -1`
for ((i=1;i<=k;i++))
do
awk '{print $'$i'}' file.txt | xargs
done
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