Linux基础命令

1，查看某个端口被哪个进程占用

lsof -i : 端口号# lsof -i:22COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAMEsshd 1646 root 3u IPv4 10862 0t0 TCP *:ssh (LISTEN)# lsof -i:21050COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAMEimpalad 18280 impala 210u IPv4 106377715 0t0 TCP *:21050 (LISTEN)

2，查看某个进程占用的端口

lsof -i | grep 进程名称# lsof -i | grep impalaimpalad   18280  impala  207u  IPv4 106377711      0t0  TCP *:irtrans (LISTEN)impalad   18280  impala  210u  IPv4 106377715      0t0  TCP *:21050 (LISTEN)

3，内存清理/释放命令
# echo 1 > /proc/sys/vm/drop_caches