合并两个目录保持较大的文件

Question

例如，考虑

mkdir dir1 
mkdir dir2 

cd dir1 
echo "This file contains something" > a 
touch b 
echo "This file contains something" > c 
echo "This file contains something" > d 
touch e 

cd ../dir2 
touch a 
echo "This file contains something" > b 
echo "This file contains something" > c 
echo "This file contains more data than the other file that has the same name but is in the other directory. BlaBlaBlaBlaBlaBlaBlaBlaBla BlaBlaBlaBlaBlaBlaBlaBlaBla BlaBlaBlaBlaBlaBlaBlaBlaBlaBlaBlaBlaBlaBlaBlaBlaBlaBla. bla!" > d 

我想合并dir1和dir2。如果两个文件具有相同的名称，则只有最大尺寸的文件必须保留。这里是合并后的目录

a # Comes from `dir1` 
b # Comes from `dir2` 
C# Comes from either `dir1` or `dir2` 
d # Comes from `dir2` 
e # Comes from `dir1`(is empty) 

Answer 1

的预期的内容假设没有文件包含换行符：

find . -type f -printf '%s %p\n' \ 
    | sort -nr \ 
    | while read -r size file; do 
    if ! [ -e "dest/${file#./*/}" ]; then 
     cp "$file" "dest/${file#./*/}"; 
    done 

基本上找到输出filesize path列表，即：

221 ./dir1/a 
1002 ./dir1/b 
11 ./dir2/a 

此列表排序数字：

1002 ./dir1/b 
221 ./dir1/a 
11 ./dir2/a 

然后每个文件都被复制，如果它们不在dest目录中。