扩展文件属性和bash

Question

我在Ubuntu bash中遇到了一个有趣的行为，我无法完全理解。 如果我将扩展文件属性添加到文件，然后更改它 - 从文件中删除属性。从我的角度来看，没问题。

user@user:~/tmp$ echo "aaa" > testattr 
user@user:~/tmp$ setfattr --name "user.test" --value "Tested" testattr 
user@user:~/tmp$ getfattr --name "user.test" testattr 
# file: testattr 
user.test="Tested" 
user@user:~/tmp$ vi testattr 
< change something in file and save it > 
user@user:~/tmp$ getfattr --name "user.test" testattr 
testattr: user.test: No such attribute 

但是，如果我用bash写文件 - 文件属性留在原来的位置。 有人可以解释这种行为吗？

user@user:~/tmp$ echo "aaa" > testattr 
user@user:~/tmp$ setfattr --name "user.test" --value "Tested" testattr 
user@user:~/tmp$ getfattr --name "user.test" testattr 
# file: testattr 
user.test="Tested" 
user@user:~/tmp$ echo "bbb" > testattr 
user@user:~/tmp$ getfattr --name "user.test" testattr 
# file: testattr 
user.test="Tested" 

Answer 1

vi正在删除已编辑的文件并将其替换为新文件。这就是为什么不保留属性的原因。

这是该文件的操作日志。

$ mkdir test 
$ touch test/file 
$ inotifywait -m -r test 
Setting up watches. Beware: since -r was given, this may take a while! 
Watches established. 
# vi is now running in another shell 
test/ OPEN file 
test/ CREATE .file.swp 
test/ OPEN .file.swp 
test/ CREATE .file.swpx 
test/ OPEN .file.swpx 
test/ CLOSE_WRITE,CLOSE .file.swpx 
test/ DELETE .file.swpx 
test/ CLOSE_WRITE,CLOSE .file.swp 
test/ DELETE .file.swp 
test/ CREATE .file.swp 
test/ OPEN .file.swp 
test/ MODIFY .file.swp 
test/ ATTRIB .file.swp 
test/ CLOSE_NOWRITE,CLOSE file 
test/ OPEN file 
test/ CLOSE_NOWRITE,CLOSE file 
test/ MODIFY .file.swp 
test/ CREATE 4913 
test/ OPEN 4913 
test/ ATTRIB 4913 
test/ CLOSE_WRITE,CLOSE 4913 
test/ DELETE 4913 
test/ MOVED_FROM file  # old file moved 
test/ MOVED_TO file~ 
test/ CREATE file   # new file created 
test/ OPEN file 
test/ MODIFY file 
test/ CLOSE_WRITE,CLOSE file 
test/ ATTRIB file 
test/ ATTRIB file 
test/ MODIFY .file.swp 
test/ DELETE file~ 
test/ CLOSE_WRITE,CLOSE .file.swp 
test/ DELETE .file.swp 

请参阅this answer以禁用该行为。