创建用户组：
groupadd usergroup
创建受限用户
输入以下命令：
useradd -d /home/user -m -g usergroup -s /bin/false user
以上命令将会在 “usergroup” 创建一个新的 SSH 用户 “user”，该用户只能使用 SSH 代理，不能登录你的 VPS 帐户。
以上命令选项的意义： -d 新账户的主目录，-m 创建用户目录 ,-g 新用户所属用户组，-s 新账户的shell权限- Usage: useradd [options] LOGIN
- Options:
- -b, --base-dir BASE_DIR base directory for the home directory of the
- new account
- -c, --comment COMMENT GECOS field of the new account
- -d, --home-dir HOME_DIR home directory of the new account
- -D, --defaults print or change default useradd configuration
- -e, --expiredate EXPIRE_DATE expiration date of the new account
- -f, --inactive INACTIVE password inactivity period of the new account
- -g, --gid GROUP name or ID of the primary group of the new
- account
- -G, --groups GROUPS list of supplementary groups of the new
- account
- -h, --help display this help message and exit
- -k, --skel SKEL_DIR use this alternative skeleton directory
- -K, --key KEY=VALUE override /etc/login.defs defaults
- -l, --no-log-init do not add the user to the lastlog and
- faillog databases
- -m, --create-home create the user's home directory
- -M, --no-create-home do not create the user's home directory
- -N, --no-user-group do not create a group with the same name as
- the user
- -o, --non-unique allow to create users with duplicate
- (non-unique) UID
- -p, --password PASSWORD encrypted password of the new account
- -r, --system create a system account
- -s, --shell SHELL login shell of the new account
- -u, --uid UID user ID of the new account
- -U, --user-group create a group with the same name as the user
- -Z, --selinux-user SEUSER use a specific SEUSER for the SELinux user mapping
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