linux

Useful Linux weblinks. Very interesting information.

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https://www.cs.cmu.edu/~gilpin/tutorial/. Debugging Under Unix: gdb Tutorial. http://docs.kali.org/general-use/starting-metasploit-framework-in-kali. Setting up the Metasploit framework in Kali Linux. http://www.backtrack-linux.org/forums/showthread.php?t=8154. Using the netdiscover command on Linux to scan for hosts on a network. https://insights.ubuntu.com/2014/10/10/watch-netflix-in-ubuntu-today/. Watch Netflix on Ubuntu with the Google Chrome browser and ditch Windows on your media center machine. http://www.linuxquestions.org/questions/programming-9/how-can-i-list-directories-only-in-linux-375219/. How to list only directories when using … Read more

How to get information out of the system logfiles on Linux. Showing failed logins.

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There are a few ways to get information out of the /var/log files using the Linux command line. Here are a few examples. Show the history of apt commands on your Linux box with this command. jason@eyjafjallajkull:~$ grep ‘Commandline: ‘ /var/log/apt/history.log Commandline: apt-get upgrade Commandline: apt-get install gnome-alsamixer Commandline: apt-get install indicator-sound-switcher Commandline: apt-get upgrade … Read more

Use the netdiscover command to find hosts on your local LAN.

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The netdiscover utility will list all connected hosts on your local LAN. This is useful for scanning a network and determining which hosts are online. I used this command to scan an IP range starting with 192.168.0.1. jason@darkstar:~$ sudo netdiscover -r 192.168.0.1/24jason@darkstar:~$ sudo netdiscover -r 192.168.0.1/24 Currently scanning: Finished! | Screen View: Unique Hosts   … Read more

How to convert a Wikipedia article to a text file using the Linux command line.

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The wikipedia2text command allows a command line user on Debian to output the contents of a Wikipedia article to a text file on your hard drive. Install this command this way: jason@darkstar:~/Documents$ sudo apt-get install wikipedia2textjason@darkstar:~/Documents$ sudo apt-get install wikipedia2text Then convert an article this way. jason@darkstar:~/Documents$ wikipedia2text Debian > Debian.txtjason@darkstar:~/Documents$ wikipedia2text Debian > Debian.txt … Read more

List files by modification date with the ls command on Linux.

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This one-liner will list all files in a directory by modification time, newest first. jason@eyjafjallajkull:~/Pictures$ ls -thuljason@eyjafjallajkull:~/Pictures$ ls -thul Use it this way to list the top 20 files listed. jason@eyjafjallajkull:/var/log$ ls -thul | head -n 20 total 6.9M -rw-rw-r– 1 root utmp 9.0K Jul 9 11:30 wtmp -rw-r–r– 1 root root 85K Jul 9 … Read more

Get the internet facing IP address of a Linux machine easily.

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This simple command will print out the Internet facing IP address of a Linux machine in no time. curl ifconfig.me/ipcurl ifconfig.me/ip This will return the useragent that is used to access this URL. ubuntu ~ $ curl ifconfig.me/ua curl/7.35.0ubuntu ~ $ curl ifconfig.me/ua curl/7.35.0 Use this string to get all information about the host that … Read more

Get information about your network connection with Linux.

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This command will return only the IP address of the host. ubuntu ~ $ hostname -i 172.31.20.16ubuntu ~ $ hostname -i 172.31.20.16 Querying for all local IP addresses on the host. ubuntu ~ $ hostname -I 172.31.20.16 10.8.0.1ubuntu ~ $ hostname -I 172.31.20.16 10.8.0.1 This simple script will ping Google and will check the return … Read more

How to get comprehensive SSL information out of a website with Ubuntu.

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The sslscan utility will print out a comprehensive report listing all of the SSL ciphers used by a website secured by SSL. This can be very useful information when you are planning to attack this website. Or just for research purposes. In this example, I am scanning facebook.com and getting information about the ssl ciphers … Read more

How to create keys with easy-rsa without a password prompt.

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To create a new set of keys for OpenVPN using Easy-RSA, we firstly need to clean our environment and get ready for the build. $ ./easyrsa init-pki$ ./easyrsa init-pki Now we need to build the certificate authority. $ ./easyrsa build-ca nopass   Note: using Easy-RSA configuration from: ./vars Generating a 2048 bit RSA private key … Read more

Add a fancy progress bar to the apt command on Linux.

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To add a fancy progress bar to the apt command on Linux, edit this file: /etc/apt/apt.conf.d/99progressbar and add the line below. Dpkg::Progress-Fancy "1";Dpkg::Progress-Fancy "1"; Save the file and when you next install software with the apt command, you will get a fancy progress bar at the bottom of the screen. This is a very nice … Read more

Get information about your computer hardware with Linux.

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Get information about installed hardware with these commands This command will print the make and model of your motherboard. jason@eyjafjallajkull:~$ sudo dmidecode -t baseboard [sudo] password for jason: # dmidecode 2.12 SMBIOS 2.4 present.   Handle 0x0002, DMI type 2, 8 bytes Base Board Information Manufacturer: Gigabyte Technology Co., Ltd. Product Name: H55-USB3 Version: x.x … Read more

Change your MAC address on Linux with the command line.

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To change your MAC address in Linux, you just need to issue these few commands, and then re-run dhcp or reconfigure the interface. This works for both wired and wireless cards. Bring down the interface. jason@eyjafjallajkull:~$ sudo ifconfig eth0 down [sudo] password for jason:jason@eyjafjallajkull:~$ sudo ifconfig eth0 down [sudo] password for jason: Set a new … Read more

List all of your IP addresses using the ip command.

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The ip command will list all of your ip addresses when combined with the grep command to look for all inet words. This is a very useful one-liner. ubuntu ~/Documents $ ip a | grep "inet " inet 127.0.0.1/8 scope host lo inet 172.31.20.16/20 brd 172.31.31.255 scope global eth0 inet 10.8.0.1 peer 10.8.0.2/32 scope global … Read more

New GTK themes for 2015. Make Linux look awesome.

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More awesome GTK themes and wallpapers for 2015. Gnome themes. Ceti-2: http://gnome-look.org/content/show.php/Ceti-2+-+Theme?content=167528. Plane GTK 3.6: http://gnome-look.org/content/show.php/Plane-Gtk3.6?content=156309. Ultra-Flat: http://gnome-look.org/content/show.php/Ultra-Flat?content=167473. Malys-Unisex: http://gnome-look.org/content/show.php/malys+-+uniSEX+?content=149602. Cinnamon themes. Zukitwo: http://gnome-look.org/content/show.php/Zukitwo-Cinnamon?content=161734. New Minty: http://gnome-look.org/content/show.php/New-Minty?content=161698. Icon themes. Evolvere icon theme: http://gnome-look.org/content/show.php/Evolvere+Icon+theme?content=164338. Wallpapers. Dead space wallpaper, creepy monster: http://4walled.cc/show-1364323. Giant world engine eating a planet: http://4walled.cc/show-1348020. Very cold looking planet with a misty atmosphere: … Read more

Calculate subnets with the Linux command line and sipcalc.

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The sipcalc utility for Linux is used to calculate subnets for IP addresses. The below example shows a /26 address and the available IP addresses and number of network nodes in the subnet. This is a good way to calculate the network mask if the network administrator requires this information to input it into a … Read more

How to get information about logins on your Linux system.

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Reading information about logins on a Linux system is very useful when you are running a Linux machine. The last command will print information about the last logins on a Linux system. ubuntu ~ $ last ubuntu pts/0 ip-10-8-0-6.ap-s Sun Apr 19 10:25 still logged in   wtmp begins Sun Apr 19 10:25:42 2015ubuntu ~ … Read more

How to get information about your Linux services with systemd.

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The systemd init system may be used to get information about your running services. Here I am getting information about the openvpn service. jason@eyjafjallajkull:~$ systemctl -a status openvpn.service ● openvpn.service – LSB: Openvpn VPN service Loaded: loaded (/etc/init.d/openvpn) Active: active (running) since Mon 2015-04-13 14:57:18 AEST; 5h 2min ago Docs: man:systemd-sysv-generator(8) CGroup: /system.slice/openvpn.service └─1719 /usr/sbin/openvpn … Read more