用户
组
有效用户
实际用户
有效用户ID
实际用户ID
1 -- 用户操作函数
linux-rwdx:~ # useradd --help
Usage: useradd ...
useradd - create a new user
-c comment Set the GECOS field for the new account
--show-defaults Print default values
--save-defaults Save modified default values
-D binddn Use dn "binddn" to bind to the LDAP directory
-d homedir Home directory for the new user
-e expire Date on which the new account will be disabled
-f inactive Days after a password expires until account is disabled
-G group,... List of supplementary groups
-g gid Name/number of the users primary group
-k skeldir Specify an alternative skel directory
-m Create home directory for the new user
-o Allow duplicate (non-unique) UID
-P path Search passwd, shadow and group file in "path"
-p password Encrypted password as returned by crypt(3)
-u uid Force the new userid to be the given number
-r, --system Create a system account
-s shell Name of the user's login shell
--service srv Add account to nameservice 'srv'
--help Give this help list
--usage Give a short usage message
-v, --version Print program version
Valid services for --service are: files, ldap
添加一个用户：
linux-rwdx:/home # useradd svn -d /home/svn -g svn linux-rwdx:/home # passwd svn Changing password for svn. New Password: Reenter New Password: Password changed. mkdir /home/svn chown -R svn:svn /home/svn
2 -- 用户组操作函数
linux-rwdx:~ # groupadd --help
Usage: groupadd [-D binddn] [-g gid [-o]] [-r] [-P path] [-p password] group
groupadd - create a new group
-D binddn Use dn "binddn" to bind to the LDAP directory
-g gid Force the new groupid to be the given number
-o Allow duplicate (non-unique) UID
-P path Search passwd, shadow and group file in "path"
-p password Encrypted password as returned by crypt(3)
-r, --system Create a system account
--service srv Add account to nameservice 'srv'
--help Give this help list
--usage Give a short usage message
-v, --version Print program version
Valid services for --service are: files, ldap