Show List of Kill Signal on Linux Fedora 9 using kill Command



Computer Configuration GNU Linux Fedora using Linux Command

 

   The Linux command example below show the use of kill command to show the list of kill signal.  The kill command below is execute with option -l to show the list of kill signal available and the example below is execute on Linux Fedora 9.

The kill command with -l option to show list of kill signal:

Kill command to show kill signal

[root@fedora ~]# kill -l

1)  SIGHUP       2) SIGINT       3) SIGQUIT      4) SIGILL

5)  SIGTRAP      6) SIGABRT      7) SIGBUS       8) SIGFPE

9)  SIGKILL     10) SIGUSR1     11) SIGSEGV     12) SIGUSR2

13) SIGPIPE     14) SIGALRM     15) SIGTERM     16) SIGSTKFLT

17) SIGCHLD     18) SIGCONT     19) SIGSTOP     20) SIGTSTP

21) SIGTTIN     22) SIGTTOU     23) SIGURG      24) SIGXCPU

25) SIGXFSZ     26) SIGVTALRM   27) SIGPROF     28) SIGWINCH

29) SIGIO       30) SIGPWR      31) SIGSYS      34) SIGRTMIN

35) SIGRTMIN+1  36) SIGRTMIN+2  37) SIGRTMIN+3  38) SIGRTMIN+4

39) SIGRTMIN+5  40) SIGRTMIN+6  41) SIGRTMIN+7  42) SIGRTMIN+8

43) SIGRTMIN+9  44) SIGRTMIN+10 45) SIGRTMIN+11 46) SIGRTMIN+12

47) SIGRTMIN+13 48) SIGRTMIN+14 49) SIGRTMIN+15 50) SIGRTMAX-14

51) SIGRTMAX-13 52) SIGRTMAX-12 53) SIGRTMAX-11 54) SIGRTMAX-10

55) SIGRTMAX-9  56) SIGRTMAX-8  57) SIGRTMAX-7  58) SIGRTMAX-6

59) SIGRTMAX-5  60) SIGRTMAX-4  61) SIGRTMAX-3  62) SIGRTMAX-2

63) SIGRTMAX-1  64) SIGRTMAX

[root@fedora ~]#

 




Display and Show Network Device Properties and IP Address using ifconfig Command



Computer Configuration GNU Linux Fedora using Linux Command

 

   The ifconfig command can be use to display or show the network device properties on Linux Fedora system.  The ifconfig command example below is executed with -a option to show all network device properties including, display or show the network IP Address (IPV4), show IPV6 network address, show network net mask and show network device hardware address (or some say Media Access Control address MAC address or Ethernet Hardware Address EHA) .  The ifconfig command example below is executed on Linux Fedora system that have 1 network device.

Show and display all network device properties on Linux Fedora:

Display and show network device properties, show ip address, show network hardware address mac address

[root@fedora ~]# ifconfig -a

eth2 Link encap:Ethernet HWaddr 00:0C:29:74:92:7B

inet addr:192.168.1.4 Bcast:192.168.1.255 Mask:255.255.255.0

inet6 addr: fe80::20c:29ff:fe74:927b/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:2920 errors:0 dropped:0 overruns:0 frame:0

TX packets:1569 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:227442 (222.1 KiB) TX bytes:220965 (215.7 KiB)

Interrupt:18 Base address:0x2000

 

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING MTU:16436 Metric:1

RX packets:1830 errors:0 dropped:0 overruns:0 frame:0

TX packets:1830 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:98666 (96.3 KiB) TX bytes:98666 (96.3 KiB)

 

[root@fedora ~]#

 




Display and Show Active Wireless Network IP Address using ifconfig Command



Computer Configuration GNU Linux Fedora using Linux Command

 

   The command example below show the use of iwconfig command to display and show the active network wireless properties including network IP Address.  The iwconfig command if issue/execute without any option, will display and show an active wireless network properties including their network IP Address... the iwconfig command below execute on Linux Fedora 9 operating system

Show active wireless network device properties:

Display and show wireless network properties and IP Address using iwconfig command

[root@fedora ~]# iwconfig

lo no wireless extensions.

 

eth2 no wireless extensions.

 

[root@fedora ~]#

 

Note: If the iwconfig command display the output as shown on command example above.... the system that you use may do not have any wireless network device and you can use the ipconfig command to show and active network device.

 




Check and Show Firewall Setting using iptables Command



Computer Configuration GNU Linux Fedora using Linux Command

The step by step example below use the iptables command tool to display the firewall setting or show the iptables configuration on Linux Fedora 9. To display the firewall rules on Linux Fedora machine , you need to have root acces. The example below show the firewall rules that allow all or have no rules, you may get the same setting of firewall rule if you not configure or set the firewall setting to Disable.

Display list of iptables firewall rules:

iptables show firewall rules

[root@fedora ~]# iptables -L

Chain INPUT (policy ACCEPT)

target prot opt source destination

ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED

ACCEPT icmp -- anywhere anywhere

ACCEPT all -- anywhere anywhere

ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh

REJECT all -- anywhere anywhere reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)

target prot opt source destination

REJECT all -- anywhere anywhere reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)

target prot opt source destination

[root@fedora ~]#




Disable NetworkManager Service Automatically start using ntsysv tool



Computer Configuration GNU Linux Fedora using Linux Command

 

   The NetworkManager is a tool for managing network connection on Linux Fedora 9, but sometimes the NetwokManager can cause conflict for other services.  The step by step example below use the ntsysv runlevel configuration tools to disable Network Manager from automatically start on boot up. 

1.  Invoke ntsysv tool:

Open ntsysv runlevel configuration tool

[root@fedora ~]# ntsysv

[root@fedora ~]#

 

The ntsysv tool interface display all service available and service that start on boot up of the Linux Fedora:

runlevel ntsysv configuration tool

2.  Find the NetworkManager ... The asterisk mark [*] define that the NetworkManager is enable on the system startup for current runlevel... remove the asterisk [*] mark on the NetworkManager hitting the space bar key.

 

3  Then use the Tab key to navigate to the OK button... and then hit the Enter key to save the runlevel configuration and exit the ntsysv tool.

runlevel configuration tools ntsysv

 

Note:  The ntsysv command above is executed on Linux Fedora 9 to disable Network Manager services from automatically start.

 




Check Kernel Version and Check Kernel Release on Linux Fedora Using uname Command



Computer Configuration GNU Linux Fedora using Linux Command

 

   The uname command below can be use to check kernel version and check kernel release.  The Linux command example below check kernel version and check kernel release on Linux Fedora 9 machine using the uname command.

Check Linux Kernel Release:

Check kernel release on Linux Fedora

[root@fedora ~]# uname -r

2.6.25-14.fc9.i686

[root@fedora ~]#

 

Check Linux Kernel Version:

Check kernel version on Linux Fedora

[root@fedora ~]# uname -v

#1 SMP Thu May 1 06:28:41 EDT 2008

[root@fedora ~]#