How to know the hostname of server ?
Command "hostname" will give you the host name of the server. from the below example linuxtechnotes is the hostname of server.
[root@linuxtechnotes ~]# hostname
linuxtechnotes
[root@linuxtechnotes ~]#
How to know the present working directory ?
command "pwd" will give you current working directory . as per below example /root is the current directory .
[root@linuxtechnotes ~]#
[root@linuxtechnotes ~]# pwd
/root
[root@linuxtechnotes ~]#
How can we know who all logined to server currently ?
#who
[root@linuxtechnotes ~]# who
linuxtechnotes tty1 2017-02-10 22:03 (:0)
linuxtechnotes pts/0 2017-02-14 22:34 (:0.0)
root pts/1 2017-02-15 20:55 (192.168.150.1)
[root@linuxtechnotes ~]#
[root@linuxtechnotes ~]#
How to know time and date in server ?
# date
[root@linuxtechnotes ~]# date
Wed Feb 15 20:58:10 PST 2017
[root@linuxtechnotes ~]#
[root@linuxtechnotes ~]#
How to know the current shell user login ?
#whoami
[root@linuxtechnotes ~]# whoami
root
[root@linuxtechnotes ~]#
[root@linuxtechnotes ~]#
How to get calender in server ?
#cal
[root@linuxtechnotes ~]#
[root@linuxtechnotes ~]#
[root@linuxtechnotes ~]# cal
February 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
How to use calculator in server ?
# bc
[root@linuxtechnotes ~]# bc
bc 1.06.95
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
19-5
14
^C
(interrupt) Exiting bc.
How to check current terminal ?
#tty
[root@linuxtechnotes ~]# tty
/dev/pts/1
How to check total memory and its usage ?
# free -m /free -g
[root@linuxtechnotes ~]# free -m
total used free shared buffers cached
Mem: 1893 640 1253 3 130 328
-/+ buffers/cache: 180 1712
Swap: 511 0 511
[root@linuxtechnotes ~]#
How to check system uptime ?
#uptime
[root@linuxtechnotes ~]# uptime
21:07:05 up 1 day, 18:01, 3 users, load average: 0.00, 0.00, 0.00
[root@linuxtechnotes ~]#
How to check system kernel and Os details ?
[root@linuxtechnotes ~]# uname -a
Linux linuxtechnotes 2.6.32-504.el6.i686 #1 SMP Tue Sep 16 01:56:19 EDT 2014 i686 i686 i386 GNU/Linux
[root@linuxtechnotes ~]#
[root@linuxtechnotes ~]# uname -r
2.6.32-504.el6.i686
[root@linuxtechnotes ~]#
[root@linuxtechnotes ~]#
How to check when system was rebooted ?
#last | grep -i reboot
[root@linuxtechnotes ~]#
[root@linuxtechnotes ~]# last | grep -i reboot
reboot system boot 2.6.32-504.el6.i Fri Feb 10 14:02 - 21:10 (5+07:08)
reboot system boot 2.6.32-504.el6.i Sat Feb 4 06:25 - 21:10 (11+14:45)
reboot system boot 2.6.32-504.el6.i Thu Feb 2 08:15 - 21:10 (13+12:55)
reboot system boot 2.6.32-504.el6.i Sun Jan 29 02:42 - 21:10 (17+18:28)
[root@linuxtechnotes ~]#
[root@linuxtechnotes ~]#
How to check history of server who are all logined with time and date ?
#last
[root@linuxtechnotes ~]# last | tail -10
root pts/1 192.168.150.1 Thu Feb 2 16:26 - 19:22 (02:55)
root pts/0 :0.0 Thu Feb 2 16:22 - crash (1+14:02)
root tty1 :0 Thu Feb 2 16:22 - crash (1+14:03)
reboot system boot 2.6.32-504.el6.i Thu Feb 2 08:15 - 21:11 (13+12:55)
root pts/1 192.168.150.1 Sun Jan 29 20:57 - 21:45 (00:48)
linuxtec pts/0 :0.0 Sun Jan 29 15:36 - crash (3+16:39)
linuxtec tty1 :0 Sun Jan 29 15:35 - crash (3+16:39)
reboot system boot 2.6.32-504.el6.i Sun Jan 29 02:42 - 21:11 (17+18:28)
wtmp begins Sun Jan 29 02:42:35 2017
[root@linuxtechnotes ~]#
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