擴展文件屬性和bash

Question

我在Ubuntu bash中遇到了一個有趣的行爲，我無法完全理解。 如果我將擴展文件屬性添加到文件，然後更改它 - 從文件中刪除屬性。從我的角度來看，沒問題。

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寫文件 - 文件屬性留在原來的位置。 有人可以解釋這種行爲嗎？

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正在刪除已編輯的文件並將其替換爲新文件。這就是爲什麼不保留屬性的原因。

這是該文件的操作日誌。

$ 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 

請參閱this answer以禁用該行爲。