Commands related to linux user permissions

Linux user permissions related Command 1, create group groupaddtest modify group groupmod-ntest2test will change the name to test2 delete group groupdeltest View Group groupsroot2, user operation:-B set the basic path as the user's... commands related to linux user permissions 1. create group groupadd test modify group groupmod-n test2 test change name to test2 delete group groupdel test View group groups root 2. user operation: -B: set the basic path as the user's login directory usermod-B/home root;-c comment on the user... -D: Set the user's logon directory usermod-d/home root;-D: change the usermod-D-e to set the user's validity period usermod-e 2013-2-1;-f: After the user expires, make the password invalid usermod-f root;-g make the user belong to only a group of usermod-f www group2;-G make the user join a group of usermod-f www group1; -h help-k (skel_dir) to specify other skel directories (directories that store user startup files)-k (key = value) -m automatically creates a login Directory-l does not add users to the lastlog file-M does not automatically create a login Directory-r creates a system account-o allows users to have the same UID-p for new users use the encrypted password; -s shell at login... -U specifies a UID for the new user;-Z deletes the User: userdel www; views the User: w/who to view its user name: whoami to view the individual user information: finger root, id root; view user logon records: last and lastb (successful and unsuccessful)