####操作系统口令加固####
sed -i '/^PASS_MAX_DAYS[:space:]*[:digit:]*/c\PASS_MAX_DAYS\t90' /etc/login.defs
sed -i '/^PASS_MIN_DAYS[:space:]*[:digit:]*/c\PASS_MIN_DAYS\t0' /etc/login.defs
sed -i '/^PASS_MIN_LEN[:space:]*[:digit:]*/c\PASS_MIN_LEN\t8' /etc/login.defs
sed -i '/^PASS_WARN_AGE[:space:]*[:digit:]*/c\PASS_WARN_AGE\t7' /etc/login.defs
chmod 600 /etc/login.defs