Linux 关于/etc/login.defs文件

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man login.defs

/etc/login.defs文件定义了与/etc/password和/etc/shadow配套的用户限制设定。这个文件是需要的，缺失并不会影响系统的使用，但是也许会产生意想不到的错误。

如果/etc/shadow文件里有相同的选项，则以/etc/shadow里的设置为准，也就是说/etc/shadow的配置优先级高于/etc/login.defs。

# *REQUIRED* required #  Directory where mailboxes reside, _or_ name of file, relative to the #   home directory.  If you _do_ define both, MAIL_DIR takes precedence. #   QMAIL_DIR is for Qmail # #QMAIL_DIR      Maildir MAIL_DIR        /var/spool/mail #创建用户时，要在目录/var/spool/mail中创建一个用户mail文件 #MAIL_FILE      .mail

# Password aging controls: # #       PASS_MAX_DAYS   Maximum number of days a password may be used. #       PASS_MIN_DAYS   Minimum number of days allowed between password changes. #       PASS_MIN_LEN    Minimum acceptable password length. #       PASS_WARN_AGE   Number of days warning given before a password expires. # PASS_MAX_DAYS   99999 #密码最大有效期 PASS_MIN_DAYS   0 #两次修改密码的最小间隔时间 PASS_MIN_LEN    5 #密码最小长度，对于root无效 PASS_WARN_AGE   7 #密码过期前多少天开始提示 # # Min/max values for automatic uid selection in useradd #创建用户时不指定UID的话自动UID的范围 UID_MIN                   500 #用户ID的最小值 UID_MAX                 60000 #用户ID的最大值 # # Min/max values for automatic gid selection in groupadd #自动组ID的范围 GID_MIN                   500 #组ID的最小值 GID_MAX                 60000 #组ID的最大值

# # If defined, this command is run when removing a user. # It should remove any at/cron/print jobs etc. owned by # the user to be removed (passed as the first argument). # #USERDEL_CMD    /usr/sbin/userdel_local #当删除用户的时候执行的脚本

# # If useradd should create home directories for users by default # On RH systems, we do. This option is overridden with the -m flag on # useradd command line. # CREATE_HOME     yes #使用useradd的时候是够创建用户目录

# The permission mask is initialized to this value. If not specified, # the permission mask will be initialized to 022. UMASK           077

# This enables userdel to remove user groups if no members exist. # USERGROUPS_ENAB yes #用MD5加密密码