Basic Essentials of OCP Linux

Basic command:
Create/Modify/delete user Useradd/usermod/userdel
Create/Modify/delete user groups Groupadd/groupmod/groupdel
Modify the owning user/owning user group Chown/chgrp
Modify Permissions chmod
Create a folder mkdir
Create a file Touch
Switch Directory CD
Delete files/directories RM
Display list Ls/ll
Edit Vim/gedit
Open File More/less/cat/tail
View Help Man
Show current working directory PWD
Moving MV
Copy CP/SCP
Permissions:
R, W, X s, S, T U (user) G (group) O (Other) 4, 2, 1 + 、-、 =
User login:
UID (userid) GID (GroupID)
/etc/passwd/etc/group
/etc/shadow/etc/gshadow
Absolute path and relative path.
grep filtering, wildcard characters

Basic Essentials of OCP Linux