Cloud Computing Learning Route course syllabus material: file attributes chattr

I'd like to share some information about the course outline of cloud computing learning route. This article is about the file attribute chattr. I hope I can give you some help:

File rights management: file attributes

Note: set file properties (permissions) for all users, including root

[root@tianyun ~] # touch file100 file200

[root@tianyun ~] # lsattr file100 file200

-e-file100

-e-file200

[root@tianyun ~] # man chattr att attribute

[root@tianyun ~] # chattr + a file100

[root@tianyun ~] # chattr + I file200

[root@tianyun ~] # lsattr file100 file200

-a mure-file100 a can only be appended but cannot be written

-iMure-file200

[root@tianyun ~] # echo 111 > file100 / / write in overwrite mode

Bash: file100: Operation not permitted

[root@tianyun ~] # rm-rf file100

Rm: cannot remove `file100': Operation not permitted

[root@tianyun ~] # echo 111 > > file100 / / write in an appended way, for example, log files are suitable for logs

[root@tianyun ~] # echo 111 > file200 I attribute cannot be changed for files applicable to / etc/suders / passwd files can only be viewed

Bash: file200: Permission denied

[root@instructor ~] # echo 111 > > file200

Bash: file200: Permission denied

[root@tianyun ~] # rm-rf file200

Rm: cannot remove `file200': Operation not permitted

[root@tianyun] # chattr-a file100

[root@tianyun] # chattr-I file200