LeetCode 194 - Transpose File

[LeetCode]Transpose File | 书影博客

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://blog.csdn.net/sole_cc/article/details/44993831
#!/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

awk '
{
    for (i=1; i<=NF; i++)  {
        a[NR,i] = $i
    }
}
NF>p { p = NF } //条件类型{动作}，没有给p赋值，p应该为0
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

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
http://accepted.com.cn/leetcode194/

while read -a line; do

    for ((i=0; i < "${#line[@]}"; i++)); do

        a[$i]="${a[$i]} ${line[$i]}"

    done

done < file.txt

for ((i=0; i < ${#a[@]}; i++)); do

    echo ${a[i]}

done

Also check http://www.cnblogs.com/ggjucheng/archive/2013/01/13/2858470.html
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