踢除其他用户]
pkill -kill -t tty 退除所有人
[查看系统版本]
cat /etc/issue | awk '{if(NR==1)print $1 FS $3}'//NR:行数 FS:空格
[快速删除]
rsync --delete-before -a -H -v --progress --stats
[查看逻辑CPU个数]
cat /proc/cpuinfo |grep "processor"|sort -u|wc -l
[查看物理CPU个数]
grep "physical id" /proc/cpuinfo|sort -u|wc -l
[查看每个物理CPU内核个数]
grep "cpu cores" /proc/cpuinfo|uniq
[从top中获取cpu]
top -n 1  |  head -n 5 | grep Cpu
[内存剩余]
free -m
[清缓存]
echo 3 >/proc/sys/vm/drop_caches
[禁ping]
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all
[抓包]
tcpdump -nn host ! \( 182.200.38.28 or 10.242.197.248 \) and udp
tcpdump -nn -i eth1 host ! \( 182.200.38.28 or 110.75.102.62 or 103.243.27.200 \) and dst 121.199.75.152 and tcp


获取linux占用cpu最多的10个进程
ps aux|head -1;ps aux|grep -v PID|sort -rn -k +3|head