Maintain some of the commands that Linux must know

lsof (list Open files) is a tool that lists the file opened by the current system. Lsof-i 4 #列举出IP V4 lsof-i TCP lists all TCP network Connections lsof-i lists all network Connections lsof-i:80 #查看一下80端口的进程lsof-i udp:53 #查看 a bit udp,53 Port lsof-u zhangy lists all files opened by a user lsof/usr/sbin/httpd find out who is using a file lsof-p 3738 lists all files opened by a PID-corresponding process Ps-ef #显示所有进程的UID, PPIP , c with stime column PS aux #不区分终端, shows all processes for all users ps-u Hadoop #显示hadoop用户的所有进程uname-a #显示系统信息uname-M #显示系统类型, in general, i386,i686 is a 32-bit system, x86,x86_64 is a 64-bit system uname-s,--kernel-name output kernel name hostname #显示主机名hostname Apple #设置主机名称编辑/etc/sysconfig/ The network permanently sets the hostname mount/dev/sda1/media/usb #挂载u盘mount-L #列出所挂载的系统umount-v/dev/sda1 #通过设备名卸载 and displays detailed procedures cat/proc/ Mounts View Mount disk information Du-ah #详细查看当前目录, subdirectories, all files and directories--max-depth=n output only the totals of the command line parameters that are less than or equal to the nth level of the directory. The--max-depth=0 function is the same as the-s option 

Vmstat Reporting statistics for virtual memory

Vmstat 2 5   #每二秒显示一次系统内存的统计信息, total 5 times

SAR (System activity Reporter report) is one of the most comprehensive systems performance analysis tools available on Linux

Sar-u-O Test 10 3

Note: Samples are sampled every 10 seconds, sampled 3 times in a row, observe CPU usage, and store the sample results in binary form into the file test in the current directory

Sar-q 10 3 Note: Sample every 10 seconds, 3 consecutive samples, monitor process queue length and average load status

Iostat can provide richer IO performance status data iostat-d-K 1 #查看TPS和吞吐量信息The parameter-D indicates that the device (disk) usage status is displayed; k Some columns that use block are forced to use kilobytes; 1 10 indicates that the data display is refreshed every 1 seconds for a total of 10 times

Maintain some of the commands that Linux must know