Linux Shell Commands Part 2

In This Part I Will Discuss Usage Of Some Commands, Which Is sometimes required while working

COMPUTER KORNER

Lets start with 'uname' command

'uname' helps to get some information about the system

'uname' with no option, prints the kernel name
root@bt:~# uname
Linux

'uname' with parameter as '-s', prints the kernel name
root@bt:~# uname -s
Linux

'uname' with parameter as '-r' reveals the kernel release
root@bt:~# uname -r
2.6.38

'uname' with parameter as '-v' reveals the kernel version
root@bt:~# uname -v
#1 SMP Thu Mar 17 22:59:29 EDT 2011

'uname' with parameter as '-o' reveals the operating system name
root@bt:~# uname -o
GNU/Linux

'uname' with parameter as '-n' reveals the node name, or the hostname
root@bt:~# uname -n
bt

'uname' with parameter as '-a' reveals kernel name, hostname, kernel release, kernel version, kernel machine hardware, and Operating system
root@bt:~# uname -a
Linux bt 2.6.38 #1 SMP Thu Mar 17 22:59:29 EDT 2011 x86_64 GNU/Linux


Next, 'ifconfig' reveals the IP Address, If it doesnt show you the IP Address, the path to 'ifconfig' is not set in the environment variables, In Later Posts I will show how to set it, For now, if this doesnt display, you need to type, /sbin/ifconfig
root@bt:~# ifconfig
eth0      ...

lo        ....

ppp0    ...


Next, to check the Default Gateway Address, 'route' command is used

'route' with no parameters reveals the Address after resolving the DNS
root@bt:~# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
yy.yy.yy.yy     *               xxx.xxx.xxx.xxx UH    0      0        0 ppp0
default         yy.yy.yy.yy     0.0.0.0         UG    0      0        0 ppp0

'route' with '-n' parameters reveals the Address without resolving the DNS
root@bt:~# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Ifaceyy.yy.yy.yy     0.0.0.0          xxx.xxx.xxx.xxx5 UH    0      0        0 ppp0
0.0.0.0         yy.yy.yy.yy     0.0.0.0         UG    0      0        0 ppp0


Next, 'whoami' reveals the current user name
root@bt:~# whoami
root


Next, 'hostname' gives some juicy info about the system

'hostname' with -i reveals the address for the host
root@bt:~# hostname -i xxx.xxx.xxx.xxx

'hostname' with -I reveals the Common address for the host
root@bt:~# hostname -I xxx.xxx.xxx.xxx


'hostname' with '-f' reveals the Fully Qualified Domain Name
root@bt:~# hostname -f
bt.foo.org

'hostname' with '-s' reveals the hostname
root@bt:~# hostname -s
bt

'hostname' with '-d' reveals the domain name
root@bt:~# hostname -d
foo.org


Next, 'uptime' is used to check how long the system has been running, which also displays the Current Time, system status, uptime, number of users.
root@bt:~# uptime
 19:51:41 up  3:30,  4 users,  load average: 0.03, 0.07, 0.07


Next, to check the date and time, 'date' command is used
root@bt:~# date
Sat Jul  7 19:52:45 IST 2012

root@bt:~#

Thats All For This Post, Stay Tuned For More, Hope this was informative.

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