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Macos cp-a无法覆盖符号链接目录_Macos_Bash_Symlink - Fatal编程技术网

Macos cp-a无法覆盖符号链接目录

Macos cp-a无法覆盖符号链接目录,macos,bash,symlink,Macos,Bash,Symlink,我有一个包含符号链接文件夹的文件夹 root |- Current document -> version 2 document |- Current folder -> version 2 folder |- Archives |- version 1 document |- version 1 folder |- ... |- version 2 document |- version 2 folder

我有一个包含符号链接文件夹的文件夹

root
 |- Current document -> version 2 document
 |- Current folder -> version 2 folder
 |- Archives
     |- version 1 document
     |- version 1 folder
         |- ...
     |- version 2 document
     |- version 2 folder
         |- ...
当我使用
cp-r
复制此目录时,文件夹会复制,但由于
-r
遵循符号链接,因此版本2会复制两次

当我使用
cp-R
复制此目录时,文件夹第一次复制时会很好,并保留符号链接。但是,在第二个副本上,它无法覆盖文件夹,说明:

cp: cannot overwrite directory 'Current folder' with 'Current folder'
我还尝试了
cp-a
=
cp-pPR
以及
-f
版本(
cp-fR
cp-fa

我认为这是一个测试,通过跟踪符号链接来查看当前文件夹是否是一个文件夹,然后无法用符号链接覆盖符号链接(它认为它是一个文件夹)


使用符号链接的文件夹一致地复制和覆盖文件夹的正确命令是什么?

这可能不是确切的答案,但可能有助于理解您到底在寻找什么。以下是我得到的:

# Assume all these happening in a parent directory name pdir.

mkdir -p test/s
mkdir -p test1/s1
cd test/s
ln -s ../../test1/s1 .  # created a symlink

# go to parent dir pdir

mkdir -p test2
cp -R test/* test2/     # Now I copy all the content of test to test2. test contains a symlink directory

ls -ld test2/s/*
18 Aug 21 14:53 test2/s/s1@ -> ../../test1/s1  # symlink dir is preserved during the copy

# Now I want to modify my source directory before copying again
# This time I will modify inside the source directory which I have already symlinked

touch test1/s1/test.txt

# Without copying I check that the symlink is correctly updated, I don't even need a copy anymore

ls -ld test2/s/s1/*
0 Aug 21 14:55 test2/s/s1/test.txt


# Now I want to create a symlink inside the source symlink directory
cd test1/
touch tmp1.txt
cd s1/
ln -s ../tmp1.txt .  # Here it is created

# go back to parent dir pdir
# Do the same copy again

cp -R test/* test2/  

# You will receive this error:  
cp: cannot overwrite directory test2/stest/stest1 with non-directory test/stest/stest1
#of course it can't because it is already there
# even though it complains it can't overwrite the symlink of the dir, 
# but it correctly updates the files that are recently created inside the source dir

ls -ld test2/s/s1/*
 0 Aug 21 14:55 test2/s/s1/test.txt
 10 Aug 21 14:59 test2/s/s1/tmp1.txt@ -> ../tmp1.txt
希望它能帮助…

它具有与osx复制/粘贴相同的行为


附言。 您可能需要注意的一个问题:

cp -a foo bar
将文件夹foo/移动到bar/(即bar/foo/file1、bar/foo/file2)


将文件夹foo/的内容移动到bar(即bar/file1,bar/file2)

我不明白的地方。如果第一次保留符号链接,为什么需要覆盖?如果您查看复制的符号链接文件夹,您没有看到其中的更新文件吗?我会更新一个新版本,比如说版本3,然后需要将符号链接指向新版本。另一件我不明白的事情是,进入finder并复制和粘贴是正确的行为。
ditto foo bar