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# Éó²éCPU½¹µãÊýÄ¿
cat /proc/cpuinfo | grep processor | wc -l
 
# Éó²éCPUʹÓÃÇéÐÎ
top

# ¶¯Ì¬Éó²éÿ¸öÀú³ÌµÄCPUʹÓÃÇéÐÎ£¬²¢Æ¾Ö¤CPUʹÓÃÂÊÅÅÐò
top -bn1 | awk '{if (NR > 7) {print $9}}' | sort -nr | head -n 10

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# Éó²éÄÚ´æÐÅÏ¢
free -m
 
# Éó²éÿ¸öÀú³ÌµÄÄÚ´æʹÓÃÇéÐÎ
top -o RES -n 1 -b

# Éó²éÒÑʹÓÃÄÚ´æ×î¶àµÄ10¸öÀú³Ì
ps aux --sort=-%mem | head -n 11

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# ÁгöÄ¿½ñÊÂÇéĿ¼ÏµÄÎļþºÍÎļþ¼Ð
ls -la

# Éó²é´ÅÅÌʹÓÃÇéÐÎ
df -h

# Éó²éÿ¸öÀú³ÌµÄ´ÅÅÌIOʹÓÃÇéÐÎ
iotop -o -b

# Éó²éÒÑÓÃÈÝÁ¿×î´óµÄ10¸öÎļþ/Îļþ¼Ð
du -a | sort -n -r | head -n 11

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# ÉèÖÃ×î´óÎļþ·­¿ªÊýÄ¿ÏÞÖÆ
ulimit -n 2048

# ÉèÖÃϵͳ±£´æ¶Ë¿ÚÊýÄ¿
echo 1024 65535 >/proc/sys/net/ipv4/ip_local_port_range

# ÉèÖÃsyslogÈÕ־ЧÀÍÆ÷
echo "*.* @10.0.0.1:514" >> /etc/rsyslog.conf

# ÉèÖÃÓʼþ¾¯±¨Ð§ÀÍ
echo "To: admin@example.com" >> /etc/mail.rc
echo "Subject: Alert!" >> /etc/mail.rc
echo "Hello Admin," >> /etc/mail.rc
echo "System Usage Is Too High." >> /etc/mail.rc
echo "Regards," >> /etc/mail.rc
echo "Your Linux System" >> /etc/mail.rc

# ׼ʱ¼ì²éϵͳ²¢ÌìÉú±¨¸æ
0 * * * * root /usr/local/bin/system_check.sh

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