Linux commands chattr and lsattr

First look at the literal explanation:

chattr: Chattr-change file attributes on a Linux file system

lsattr -list file attributes on a Linux second extended file system

chattr command usage: chattr [-RVF] [-v version] [mode] files ...
The [mode] section is composed of +-= and [Asacddiijsttu] to control the properties of the file.
Parameter view, execute man chattr or man lsattr
Use list:
1, prohibit modification, add user attributes
# chattr +I/ETC/PASSWD
# LSATTR/ETC/PASSWD
The following properties are displayed
----I------e-/etc/passwd
2. Protection of log files:
# chattr +a/var/log/messages

Linux commands chattr and lsattr