Utility Linux Commands

lsof-i:6379

See if a program on a port is up.

Netstat-tnlp

You can view the listening ports, where L is listening, p is display program, n is the display IP instead of name, and T appears to be viewing only the contents of TCP.

View memory usage or CPU usage every 5 seconds:

$ vmstat 5-----------memory-------------Swap-------io------System------CPU---- R  B   swpd   Free   buff  cache   si   so    bi   bo    in 3  0      0 123047944 337712 6273224    0    0     0     1    0     0  0  0  0 0  0      0 123085800 337712 6273252    0    0     0    41991  6856  0  1  0^ 52.6.32_1-18-0-0 ( gzns-ecom-baiduhui-201605-m42n04.gzns.baidu.com)         10/09/2016      _x86_64_        ( CPU)12:03:14 AM  CPU    %usr   %nice    %sys%iowait    %irq   %soft  %steal  %guest   Idle 12:03:19 AM  all    0.03    0.04    0.09    0.03    0.00    0.00    0.00    0.00   99.8212:03:24 AM  all    0.04    0.10    0.33    0.04    0.00    0.00    0.00    0.00   99.50

Utility Linux Commands