/etc/passwd
/*name:password:UID:GID:GECOS:directory:shell*/
/etc/shadow
login name
encrypted password
date of last password change
minimum password age
maximum password age
password warning period
password inactivity period
account expiration date
reserved field
/etc/group
/*group_name:password:GID:user_list*/
/etc/skel
/etc/default/useradd
GROUP=100??? /*users組*/
HOME=/home??? /*家目錄路徑*/
INACTIVE=-1?? /*口令過期 仍然不登錄 鎖定賬號*/
EXPIRE=???? /*過期時間*/
SHELL=/bin/bash??? /*默認的shell*/
SKEL=/etc/skel??? /*家目錄配置文件模板路徑*/
CREATE_MAIL_SPOOL=yes? /*自動創建郵箱*/
/etc/login.defs
PASS_MAX_DAYS????????? /*默認密碼配置*/
PASS_MIN_DAYS
PASS_MIN_LEN
PASS_WARN_AGE
MAIL_DIR? /var/spool/mail?? /*默認郵箱路徑*/
UID_MIN???? /*UID GID默認范圍*/
UID_MAX??? /*用戶指定能超過這個范圍*/
SYS_UID_MIN
SYS_UID_MAX
GID_MIN
GID_MAX
SYS_GID_MIN
SYS_GID_MAX
ENCRYPT_METHOD SHA512? /*加密算法*/
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