Transpose File
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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 agealice 21ryan 30
Output the following:
name alice ryanage 21 30
题意：从file.txt中读取数据，相当于调换行和列，将列变成行
思路：主要用了read -a来读取数据到数组中，以及涉及到数组的操作，如${#array_name[@]}表示数组array_name的长度，数组元素的引用${array_name[i]}表示数组array_name的第i个元素（下标从0开始）代码如下：
while read -a columns #读取一行到数组columns中do for ((i=0; i < ${#columns[@]}; i++)) # ${#columns[@]}表示数组长度doa[i]="${a[i]} ${columns[i]}"donedone < file.txtfor ((i=0; i < ${#a[@]};i++))doecho ${a[i]}done
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