Linux 常用命令

==================== common ====================

scp 下载文件
# scp -r -P 22 root@<ip>:/<abs_path> /<abs_path>

==================== process ====================

查看进程数
# ps -T -ef | awk '{print $2}' | sort -n | uniq -c | sort -n

查看文件数
# ls -lR | grep "^-" | wc -l

==================== network ====================
# tcpdump -i eth0 -w /tmp/out.tcpdump
# tcpdump -nr /tmp/out.tcpdump
  [-n 禁用将ip地址转换为主机名, -e 链路层报头, -x 十六进制地址转储, -ttt 显示数据包时间差, -tttt 第一个数据包发送以来的时间]