LINUX USUAL COMMANDS

SYSTEM

• uname -a (Display linux system information)
  aaa.example.com 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
• uname -r (Display kernel release information)
  3.10.0-327.el7.x86_64
• uptime (Show how long the system has been running + load)
  12:24:35 up 18:01, 4 users, load average: 0.05, 0.11, 0.11
• hostname (Show system hostname)
  aaa.example.com
• hostname -i (Show the IP address of the host)
  192.168.5.200
• last reboot (Show system reboot history)
  reboot system boot 3.10.0-327.el7.x Wed Sep 27 06:48 - 12:27 (2+05:38)
• date (Show the current date and time)
  Fri Sep 29 12:28:27 EDT 2017
• cal (Show the month calender )

   September 2017   
  Su Mo Tu We Th Fr Sa
               1  2
  3  4  5  6  7  8  9
  10 11 12 13 14 15 16
  17 18 19 20 21 22 23
  24 25 26 27 28 29 30
  

• w (Display who is online )

   12:33:17 up 18:10,  4 users,  load average: 0.01, 0.06, 0.09
  USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
  user     pts/0    :1               09:11   12:45   0.08s  0.08s /bin/bash
  user     :1       :1               03:51   ?xdm?   7:36   0.14s gdm-session-worker [pam/gdm-password]
  user     pts/1    :1               09:26    5.00s  0.24s  0.03s vim LinuxUsualCommand.md
  user     pts/2    :1               12:21    5.00s  0.06s  0.02s w
  

• whoami (Who you are logged in) user
• finger user (Display information about a user)