vi /etc/login.defs
修改設定
#
# Password aging controls (used by useradd):
#
#   PASS_MAX_DAYS   
#      Maximum number of days a password may be used.
#   PASS_MIN_DAYS   
#      Minimum number of days allowed between password changes.
#   PASS_WARN_AGE   
#      Number of days warning given before a password expires.
#
PASS_MAX_DAYS   90  # 設定 90 天要改密碼
PASS_MIN_DAYS   0 
PASS_WARN_AGE   7  # 7天前要提醒
 
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