View User Groups tail -3 / etc / group
View user tail -3 / etc / passwd
View user's password tail -3 / etc / shadow
Add Group (groupadd) Modify Group (groupmod) Delete Group (groupdel)
increase users (useradd) modify the user (usermod) Delete User (userdel)
groupadd increase a user group usage groupadd [-g group id] group name example groupadd-g502javaf ( specify the group id = 502) groupadd javae (not specified group id, automatically generated by the system)
Note: the above two commands will not run successfully because there may already exist 502 or javaf, javae group this time you can tail / etc / group to view information leading to the group if it already exists can not join properly, please delete it..
groupdel delete a group groupdel group name usage examples groupdeljavae
groupmod modify a set of usage groupmod [-g group id] [- n new group name] group example g509javaf groupmod-name-njavax groupmod javaf
the useradd additional user usage useradd [-g group name] [- d home directory] example javaf-G-D the useradd / var / javaf03 / javaf03
the usermod modify a user usage usermod [-g group name] [- d home directory] [- l new user name] user name-G502-d example the usermod / home / javaf03javaf03
userdel to delete a user usage userdel username