Linux system O & M skills

We have the requirement that the next file in the Linux system cannot be modified, deleted, or added only. We can use the chattr command.

[Root @ serv01 test] # cat note.txt
1. Do not be late
2. Do not leave early
3. Do not smoke
[Root @ serv01 test] # chattr + I note.txt

# Cannot be edited by any root user
[Root @ serv01 test] # vim note.txt
[Root @ serv01 test] # cat note.txt
1. Do not be late
2. Do not leave early
3. Do not smoke

# Root users cannot delete modifications
[Root @ serv01 test] # rm-f note.txt
Rm: cannot remove 'note.txt ': Operation not permitted
[Root @ serv01 test] # echo "this is test"> note.txt
-Bash: note.txt: Permission denied

# Ll. You cannot view the file attributes. You need to use lsattr to view the attributes.
[Root @ serv01 test] # ll note.txt
-Rw-r --. 1 root 45 Sep 21 17:46 note.txt
[Root @ serv01 test] # lsattr note.txt
---- I -------- e-note.txt

# It is a relative concept that root users cannot modify. root users can modify the attributes of files.
[Root @ serv01 test] # chattr-I note.txt
[Root @ serv01 test] # lsattr note.txt
------------- E-note.txt
[Root @ serv01 test] # vim note.txt
[Root @ serv01 test] # cat note.txt
1. Do not be late
2. Do not leave early
3. Do not smoke
4. Don't come to work

# Message board: What You Said cannot be deleted
[Root @ serv01 test] # vim note.txt
[Root @ serv01 test] # cat note.txt
1. Do not be late
2. Do not leave early
3. Do not smoke
4. Don't come to work
Hello
[Root @ serv01 test] # chattr + a note.txt
[Root @ serv01 test] # lsattr note.txt
----- A ------- e-note.txt
[Root @ serv01 test] # vim note.txt
[Root @ serv01 test] # ls
Note.txt ~ Note. txy ~ Note. txz ~
# Delete, no permission found
[Root @ serv01 test] # rm-rf *
Rm: remove regular file 'note.txt '? Y
Rm: cannot remove 'note.txt ': Operation not permitted
[Root @ serv01 test] # ls
Note.txt upload
[Root @ serv01 test] # echo "hello world"> note.txt
-Bash: note.txt: Operation not permitted
# You can only append the content.
[Root @ serv01 test] # echo "hello world"> note.txt
[Root @ serv01 test] # cat note.txt
1. Do not be late
2. Do not leave early
3. Do not smoke
4. Don't come to work
Hello
Hello world

[Root @ serv01 test] # chattr-a note.txt
[Root @ serv01 test] # lsattr note.txt
------------- E-note.txt

 

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