Linux命令

本文主要记录一些常用的命令，方便后面查阅

dmidecode命令是同事告诉我的，确认当前机器是实体机还是虚拟机，之前看过很多办法，总是忘记，这一条真的是一个万金油，其他的用处还可以再发掘

# dmidecode -s system-product-name
VMware Virtual Platform

# dmidecode -t 1
# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 2.7 present.

Handle 0x0001, DMI type 1, 27 bytes
System Information
        Manufacturer: VMware, Inc.
        Product Name: VMware Virtual Platform
        Version: None
        Serial Number: VMware-56 4d 07 c6 7d b5 42 7b-6c cd 54 88 3a 49 a1 66
        UUID: c6074d56-b57d-7b42-6ccd-54883a49a166
        Wake-up Type: Power Switch
        SKU Number: Not Specified
        Family: Not Specified

对于多线程的程序，top命令可以查看每个线程的运行情况，查看9883的每一个线程，运行情况

# ps -ef | grep redis
redis      9883      1  0 17:39 ?        00:00:23 redis-server 0.0.0.0:6379
redis     12305      1  0 21:26 ?        00:00:00 redis-server 0.0.0.0:6380
redis     12344      1  0 21:26 ?        00:00:00 redis-server 0.0.0.0:6381
root      12921  12817  0 21:32 pts/0    00:00:00 grep --color=auto redis

# top -p 9883 -H
top - 21:32:41 up  7:46,  4 users,  load average: 0.00, 0.01, 0.05
Threads:   5 total,   0 running,   5 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  0.3 sy,  0.0 ni, 99.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :  1863012 total,   981796 free,   232296 used,   648920 buff/cache
KiB Swap:  2097148 total,  2073596 free,    23552 used.  1452172 avail Mem

   PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND
  9883 redis     20   0  164984   7776   1640 S  0.0  0.4   0:22.34 redis-server
  9884 redis     20   0  164984   7776   1640 S  0.0  0.4   0:00.00 bio_close_file
  9885 redis     20   0  164984   7776   1640 S  0.0  0.4   0:00.00 bio_aof_fsync
  9886 redis     20   0  164984   7776   1640 S  0.0  0.4   0:00.00 bio_lazy_free
  9887 redis     20   0  164984   7776   1640 S  0.0  0.4   0:01.32 jemalloc_bg_thd

du用的时候习惯使用du -sh，后面又发现了新的方式，可以统计总大小，最后的面的total就是所有目录的大小

# du -ch *
4.0K    anaconda-ks.cfg
0       Desktop
0       documents
0       Downloads
4.0K    initial-setup-ks.cfg
0       Music
0       Pictures
0       Public
0       Templates
0       Videos
8.0K    total